warning lights AUDI Q7 2012 Owner´s Manual

Defective light bulb warning
The defective light bulb warning tells you
when a vehicle light bulb has become defec­
tive.
Fig . 14 D isplay : defective lig ht bu lb warn ing
The defective light bu lb warning monitors the
function of the light bulbs . If th is symbol
ii
illuminates, a brake light, a turn signal (front
or rear), a headlight, the backup light, a fog
light or a rear fog light has failed.
A WARNING
- light bu lbs are pressurized and could ex­
plode while they are being changed caus­
ing serious personal injury.
- Work w ith due care when handling the
high-voltage section of gas discharge
(xenon) lights. Fa ilure to do so could re­
sult in dea th o r se rious injury.
(D Tips
Have the bulb replaced or the connection
repa ired by you r autho rized Aud i Service
department.
Dri ver inform ation di spl ay 23
Service interval display
The service interval display reminds you when
your next service is due .
Fig . 1 5 Display: Serv ice interva l d isplay
T he schedule for the nex t oi l change or inspec­
tion is ca lculated automatica lly and disp layed
accordingly. The disp lay works in two stages:
Service reminder
30 days before t he nex t se rvice is due, a serv­
i ce reminde r appea rs in the display whe n you
turn on the ignition
~fig. 15.
After about 5 seconds the display switches
back to norma l. The distance and time re­
mai ning are updated each time the ignit ion is
turned on unt il t he da te d ue for se rv ice is
reached.
Service due
When the due date fo r se rvice is reached, the
mes sage
Se rv ice due! appears in the instr u­
ment cluster immed iate ly after yo u tur n on
the ignit ion. Addit iona lly, a warning tone
sounds. After about
5 seconds the disp lay
switches back to normal.
Calling up the service schedules
If or when an oil change o r inspection is due,
can be shown in the MMI display by selecting
the service in terval d isplay in the car menu .
Se lect funct io n button
ICARI > contro l button
S ys tem s* > Service inter val display or I CAR I>
control button Car sy stems * > Servicing &
checks > Service inte rvals .

32 Driver information display
warning goes out after about 5 seconds, but it
can be brought up at any time by pressing the
I CHECK ! button again.
Usually , you can still drive to the next dealer­
ship. Turn off all but the most necessary elec­
trica l consumers, since these drain the vehi­
cle's battery.
(D Note
If the . warning symbol (coolant system
malfunction) also lights up on the instru­
ment panel during the trip
¢ page 32,
then you have to stop immediately and
turn off the engine. The coolant pump is
not working anymore -danger of damage
to the engine!
BRAKE/( ©) Brake system malfunction
A malfunction in the brake system must be
repaired as soon as possible .
If the warning/indicator light-(USA
models)/ . (Canada models) in the instru­
ment cluster flashes, there is a brake system
malfunction. By pressing the
I CHECK ! button,
you can bring up a driver message which ex­
plains the malfunction in more detail.
Stop vehicle and check brake fluid level
> Pull off the road .
> Stop the vehicle.
> Turn off the engine.
> Check the brake fluid level¢ page 268 .
> Contact your nearest authorized Audi dealer
or qualified workshop if necessary.
Warning! Fault in brake system. Contact
workshop
> Drive carefully to the nearest authorized
Audi dealer or qualified workshop and have
the malfunction corrected ¢
&_.
If the ABS system malfunctions, the ABS
warning/indicator light illuminates together
with the brake system malfunction warning/ indicator light¢&. .
A WARNING
-Always observe the warnings in
¢ page 248, Engine compartment, be­
fore opening the hood and checking the brake fluid .
- Driving with low brake fluid is a safety
hazard . Stop the car and get professional
assistance .
-USA models: If the - warning light
and the
B warning light come on to­
gether, the rear wheels could lock up
first under hard braking. Rear wheel lock­
up can cause loss of vehicle control and
an accident. Have your vehicle repaired
immediately by your authorized Audi
dealer or a qualified workshop. Drive
slowly and avoid sudden, hard brake ap­
plications.
- Canada models: If the brake warning
light . and the ABS warning light
II]
come on together, the rear wheels could
lock up first under hard braking . Rear
wheel lock-up can cause loss of vehicle
control and an accident . Have your vehi­
cle repaired immediately by your author­
ized Audi dealer or a qualified workshop .
Drive slowly and avoid sudden, hard
brake applications.
- L Engine cooling system malfunction
A malfunction in the engine cooling system
must be repaired as soon as possible.
When the. symbol in the display blinks,
then either the engine coolant
temperature is
too high, or the coolant
level is too low. An
additional driver message can also be dis­
played by pressing the
I CHECK! button:
Switch off engine and check coolant level
> Pull off the road.
> Stop the vehicle .
> Turn off the engine.
> Check coolant level¢ page 266 .
> Add coolant if necessary¢ page 267.
> Continue driving only after the engine cool-
ant warning/indicator light goes out.
1J>

~ Contact your authorized Audi dea ler fo r as -
sistance if necessary.
If the engine coolant level is co rrect, then the
radiato r fan may be the cause of the malfunc­
tion.
If the . warning symbo l (alternator mal­
f u nction) a lso l ights up on the instr ument
panel ¢
page 31, then the fan belt may be
damaged .
A WARNING
- If your vehicle should break down for
mechanica l or other reasons, park at a
safe distance from moving traffic, turn off the engine and turn on the hazard
warning lights¢
page 60, Emergency
flasher.
-
- Never open the hood if you see or hear
steam o r coolant escap ing from the en­
gine compartment - you risk being scald­
ed. Wait until you can no longe r see or
hear steam or coo lant escaping.
- The e ngine compartment of any ve hicle
is a da ngerous a rea. Before you perform
any wor k in the engine compar tment,
t ur n o f the eng ine and allow it to cool.
Follow the warning stickers¢
page 248,
Engine compartment .
(D Note
Do not cont in ue d riving if the . symbol
illuminates. There is a malf unct ion in the
engine cooling system -you co uld damage
your eng ine.
9=:7-Engine oil pressure malfunction
The red engine oil pressure warning symbol
requires immediate service or repair. Driving
with a low-oil -pressure indication is likely to
inflict severe damage to the engine.
If the . symbo l appears in the disp lay and
b links, the oil press ure is too low . An addition ­
a l dr iver message can also be disp layed by
press ing the
I CH ECKi button:
Switch off engine! Oil p ressure too low
Dri ver information di spla y 33
Immediate act ions
~ Pull off the road.
~ Stop the vehicle.
~ T ur n off the engine .
~ Check the engine oil le vel with the dipstick
¢ page 263.
Dipstick readings check s too low
~ Top off oil to the proper level¢ page 264.
~ Make s ure that the oil pressure wa rning
symbo l. appears no longer in the display
before you start driving again.
Dipstick read ing checks OK
~ If the oil p ress ure warn ing symbol .
s t arts flashing aga in even though the en­
gine oil level checks OK on t he d ipstick,
do
not continue d riving and do not let the en­
gine run in idle .
Instead, contact your au­
thorized Audi dealer for assistance.
(D Tips
- The engine oil pressure symbol. is
not an indic ator for a low engine oil lev­
el. Do not rely on it . Instead, check the
oil level in your engine at regular inter­
vals, preferably each time you refuel,
and always before going on a long trip .
- The yellow oil lev el warn ing indication
1111 requires oil refill or workshop s erv­
ice without delay . Do not wait until th e
red oil pre ssure warning . start s to
flash before you r espond to the low oil
level warning
Ill . By then , your engine
may already have suffered serious dam­
age.
i Steering malfunction
If there is a malfunction in the electronic
steering column lock, the steering cannot be
unlocked .
If the I symbol i n the display blinks, there is
a malfunction in the electronic steering col­
u mn lock. An additional driver message can
a lso be displayed by pressing the
ICHECK I but-
ton:
~

36 Driver in formation d isplay
When this symbo l (I illuminates for the f irst
time, the fuel reserve in your vehicle is sti ll
between 2 .6 and 3 .2 gallons (10- 12 liters) .
Refue l as soon as possib le
¢ page 252.
If the symbol lights up, even when there is
ample fuel in the tank, and the text
T a nk sys ­
tem malfunct ion! Cont act wor kshop
appears
in the display, there is a fault in the system.
Contact a qualified workshop to have the fau lt
rectified.
t::l Battery voltage
If the battery's state of charge is not in the
optimal range, the
f• ) symbol is shown in the
d isplay and the dr iver message
Low battery
c harge : battery will be charg ed while driving
appears.
Wh ile this dr iver not ificat io n is displayed, you
have to be p repared for lim ited start ing capa­
b ili ty.
Driv er m essage appears and goes out
again
I f t his driver message appears after the igni ­
tion is turned o n or wh ile driving and it goes
out again after a while, the battery has been
adequately recharged .
Driver message app ears and does not go
out again
If th is driver notification appears after the ig ­
nition is turned on or while driving and does
not go out again, the battery's state of charge
is not in the opt imal range. Starting capability
is restricted. Have the battery checked by an
author ized Audi dealer as soon as poss ible .
{0 : Worn brake pads
El Brake pads !
If the warn ing light illum inates, immediately
contact your authorized Audi dealer or quali­
fied workshop to have all brake pads inspect­
ed . On USA models the wa rning light
El
l ) - : USA mod els only
comes on together with the warning light
- · Both sets of bra ke pads on an ax le
must a lways be rep laced at the same time.
A WARNING
=
Driving w it h bad brakes can cause a colli-
sion and ser ious personal in jury.
- If the warn ing light
El and the warning
light
11111> with the message Brake
pads!
comes o n in the inst rument cluster
d isp lay, immediately contact your au­
thor ized Audi dealer or qualified wo rk­
shop to have all b rake pads checked or
re placed if ne cessa ry.
~(i) Headlight range control
II He adlight range control defective !
-
If the symbol illuminates, the dynamic head­
li ght rang e control is no longer work ing prop­
erly. Have the system checked and repa ired at
yo ur aut horized Aud i dea le r.
~ -Engine oil level
l!I Plea se check oil level
When the symbol illuminates, check the en­
gine o il leve l as soon as possible
¢ page 263.
T op off t he oil at your ear liest opportu nity
¢ page 264 .
't::r.~ Engine oil sensor defective
II Oil level ! Sensor defective
If the symbol illum ina tes, contact yo ur au ­
thorized Aud i dea le r and have the oil sensor
inspected. Unti l yo u have this done, check t he
oi l level each time you refue l just to be on the
safe s ide
¢ page 263.
!?) Engine speed limitation
Applies to vehicles: wit h engine speed limitatio n
II! Do not e xceed ma x. engine speed of X XXX
rpm .,,.

The IPJ symbol illuminates when there is an
engine control malfunction. The indicator
light ~ in the instrument cluster also illum i­
nates. The engine speed is limited to the
speed d isplayed in the driver information sys­
tem. Keep in mind that the eng ine speed will
not exceed the value displayed in the drive r in­
formation system, for example when down­
shifting.
Please go to an authorized Aud i dealer or oth­
e r qualified workshop to have the malfunction
repaired.
~ Diesel particulate filter clogged
Applies to vehicles: with diesel engine and diesel part icu­
late filter
1,1 Particulate filter See owner's manual
When the. symbo l illuminates, you can al­
ter your driving style to assist the filter self­
cleaning process. Drive for approx imately
15
minutes with the selector lever in the S pos i­
tion at a min imum speed of 37 mph (60 km/
h) and an engine speed of approx imately
2,000 RPM. The temperature increase that
w ill result from this can burn
off the soot in
the filter. The symbol wi ll switch
off when the
cleaning is successf ul. After a successful
cleaning, there is no need to bring the car to
an author ized dealer or qualified workshop
because this is part of normal vehicle opera­
tion .
If the symbo l
II does not switch off, see
your authorized dealer or other qualified
workshop to have the prob lem corrected.
F or more information on the diesel particu­
late filter, refer to¢
page 229.
A WARNING
Always adapt yo ur speed to the current
weather, road and traffic condit ions. You
should never disobey traffic laws in order
to follow driv ing recommendations.
-
Driver information display 37
~O Adapt ive light defective
Applies to vehicles: with adaptive light
ml adaptive light defective
When this symbol ml ill uminates, it means
that adaptive light is defective. Go to an au­
thorized deale rship to have the headlights or
the control unit for the adaptive light re­
paired.
~ Ignition lock malfunction
If the!! symbol in the display comes on,
there is a ma lfunction in the e lectronic igni­
tion lock. An additional driver message can be
displayed by pressing the
I CHECK! button:
Ignition lock defective
11> Drive to an authorized Audi dealer or quali­
fied workshop at your earl iest convenience
t o have the malfunction corrected .
~ Windshield wipers faulty
fl Windshield wiper defective
When this symbo1 (.j illuminates, it means
that the electronics for the windsh ield wipers
are defective. Please go to an authorized Audi
dealer or qualified workshop to have the
winds hield wiper system repaired.

42 Openin g and clo sing
readiness light, located in the upper part of
the driver's door panel, will start to blink.
- T he vehicle interior lights turn off.
Unlocking and l ocking with Conven ience
k ey*
On vehicles which a re equipped w ith the C o n­
ve nience k ey*
authorization system, the
doors are unlocked without a key by means of
a proximity sensor in the door handle. The
doors are simi larly locked without a key using
the locking button. Each door has a proximity
sensor and a locking button .
Automatic l ock ing
The automatic locking feature locks all the ve­
hicle doors and the rear lid when you drive
faster than 9 mph (15 km/h). This function can be turned on and off in the MMI
C entr al
lo cking
Menu c:> page 44.
You can un lock the vehicle from the inside by :
- removing the key from the ign it ion sw itch
(the vehicle will automat ica lly unlock itself)
or
- pressing the unlock part of the power lock
switch @or
- pull ing the door handle (twice to open the
rear doors).
Unintent ionall y locking yourself out
In the following cases there safeguards to
prevent you locking your remote master key in
the vehicle :
- The veh icle does not lock with the power
locking sw itch
c:> page 44 if the driver's
door is open.
- On vehicles with Convenience key* , if the
most recently used master key is in the lug­
gage compartment, the rear lid is automati­
cal ly unloc ked aga in after it is closed.
Do not lock your vehicle with the
r e mot e m as ­
t e r k ey or Convenienc e key*
until all doors
and the rea r lid are closed. In t his way you
avoid locking yourse lf out accidenta lly.
A WARNING
- When you lock your vehicle from outside,
nobody- espec ially children -should re ­
main inside the vehicle . Remember,
when you lock the vehicle from the out­
side the windows cannot be opened from
the inside.
- When you leave the veh icle, always re­
move the ignition key and take it with
you . This will prevent passengers (chil­
dren, for example) from accidentally be ­
ing locked in the vehicle should they acci­
dentally press the power locking switch
in the front doors.
- Do not leave children inside the vehicle
unsupervised. In an emergency it would
be imposs ible to open the doors from
the outside without the key.
(D Tips
- In the event of a crash with airbag de­
ployment all locked doors will be auto­
matically unlocked to give access to the
vehicle occupants from the outside.
- If the power locking system sho uld mal­
function, you can lock each door individ­
ually using the vehicle key
c:> page 45 .
-If the power locking system shou ld fa il,
you can still open the fuel tank flap in an
emergency
c:> page 2 55 .
-You are well advised not to keep va lua­
bles inside an unattended vehicle, v is ible
or not. Even a properly locked vehicle
cannot p rov ide the secur ity of a safe .

Unlocking and locking the vehicle with
the remote control
How the remote control works.
Fig. 32 Remot e contr ol: fun ctio n but ton s
Either the driver 's door only or the entire vehi­
cle will unlock when the unlock button @ is
pressed once, depending on the settings in
the MMI
Central locking menu ¢ page 44 .
To unlock the vehicle ffi
.. Press button @.
.. Press button @two
times within two sec­
onds
to unlock all doors and the rear lid .
To lock the vehicle 5'.l
.. Press button @¢.&. in General description
on page 42 .
.. Watch that all turn signal lights flash once.
To unlock rear lid only~
.. Press button © for app roximately one sec­
ond .
PANIC Button
.. Push the red button@) to act ivate the panic
function. The horn sounds and the turn sig­ nals flash .
.. Push the button @again to deactivate the
panic function.
On vehicles w ith Convenience key*, the selec­
tor lever must be in the P posit ion, otherwise
the vehicle cannot be locked.
_& WARNING
Read and follow all WARNINGS ¢&. in
General description on page 42.
-
Opening and closing 43
@ Tips
-In order to make sure the locking func­
tion is working, you should a lways keep
your eye on the vehicle to make s ure it is
properly locked.
- Do not use the remote control if you are
inside the car, otherwise you may unin­
tentionally lock the vehicle, and then you
would set off the anti-theft alarm when
you try to start the eng ine or open a
door . In case this happens anyhow, push
the unlock button@.
- Use the pan ic function on ly if you are in
an emergency s ituation.
Operating locks with the key
To lock and unlock the vehicle from the out­
side, turn the key in the lock of the driver's door .
Fig. 33 Key turns fo r open in g and clos ing .
To unlock the vehicle
.. Insert the key into the lock of the driver's
door .
N N N :;
~
.. Turn the key one time to position @to un­
lock the driver's door.
.. Turn the key
two times to position @
¢
fig . 33 to unlock all doors and the rear lid .
To lock the vehicle
.. Close all windows and doors properly.
.. Turn the key in the lock of the driver's door
to the lock pos ition @ ¢
A in General de-
scription on page 42. ..,.

Clear vision Lights
Switching the headlights on and off
In the "AUTO" position, a light sensor auto·
matically switch es t he head· and taillights on
and off in r espons e to light conditions .
Fig. 53 Instrument pane l: lig ht sw itch
The ligh t sw itch m ust not be overturned pas t
the stops in
eit her direct ion .
Sw itching on automatic headlight control
,.. Turn the light switch to AUTO ¢ fig . 53 .
Swi tching on the side m ark e r lights
,.. Turn the light switch to :;oo:;.
Sw itching on the headlights and high
be am
,.. Turn the light switch to io .
,.. Push the high beam lever forward towards
the instrument panel
9 page 60 .
Switching off the light s
,.. Turn the light switch to 0.
The headlights only wo rk when the ignition is
sw itched on. While s tart ing the engine or
when switching
off the ignition, the head ·
lights will go
off and on ly the s ide marker
lights will be on .
Afte r star ting t he engine, the headlights are
automatically adjusted* to the load and angle
of the vehicle (for example, during accelera ·
tion, braking). This prevents oncoming traffic
from experiencing unnecessary headlight glare from your headlights.
Clear vi sion 5 7
If the system is not ope rat ing properly, a
warning symbol in the Auto-Check Control is displayed ¢
page 36.
With the side ma rker ligh ts or he ad ligh ts
switched on, the symbol next to the light
switch i lluminates
:oo :.
Daytime running lights
- USA model s:
The daytime runn ing lights
w il l come on automatically whe n the igni­
tion is t urne d on and the l ight sw itch
¢
fig. 53 is in the O position or the AUTO po ­
sition (only in daylight conditions). The
Day­
time running lights
function can be turned
on and
off in the MMI menu E xter ior l ight ·
ing
¢ page 58.
- Canada models: The dayt ime running lights
w ill come on automatically when the igni·
tion is turned on and the light switch
¢
fig. 53 is in the O position o r the AUTO po ·
sition (only in daylight condit ions) ¢ .&. .
Automatic headlight control
In the switch position AUTO the automatic
headlight control
i s turned on. The low
beams and tail lights are turned on automati·
ca lly through a light sensor as soon as amb i­
ent b rightness (e.g . when driving into a t un­
nel) fa lls below a value p reset a t the factory.
When ambien t brightn ess increases ag ain ,
the low beams are turned
off ag ain automati­
ca lly ¢ .&. .
In the
AUTO posi tion the low beams a re
swi tched
off au tom ati cally when the igni tion
is tur ned
off.
Light Sensor Malfunction
In the event of a light sensor malfunction, the
dr ive r is notified in the instrument cluster dis­
play:
f'gl Automatic head lights / automatic wip ers
defective
For safety reasons the low beams are turned
o n permanently with the switch in
AUTO .
However, you can conti nue to turn the lights
o n and
off using the light switch . Hav e the II>

58 Clear vis ion
lig ht sensor checked as soo n as poss ible at an
author ized Audi dealer or qua lified wor kshop .
.&_ WARNING
-Daytime ru nning lights and automatic
headlights are only intended to assist
the driver. They do not relieve the driver
of his respons ib ility to check the head­
lights and to turn them on manually ac­
co rding to the current light and v is ibi lity
condit ions. For example, fog cannot be
dete cted by the light sensors*. So alw ays
switch on the headlights
io u nder these
weather conditions and when driving in
the dark.
- Crashes can happen when yo u cannot see
the road ahead and when you cannot be seen by other motorists. Always turn on
the headlights so that you can see ahead
and so that others can see yo ur car from
the back.
- Please obey a ll laws when using the
lighting systems described here.
@ Tips
- With the switch in AUTO front fog lights
and rear fog lights cannot be turned on in addition.
- The light senso r for headlight contro l is
l ocated in the rear view m irror mount.
You should therefore not app ly any st ick­
ers to the windsh ield in this area in o rder
to preve nt ma lfunctions o r failures.
- Some exterior lighting functions can be
adjusted
c:> page 58.
-When you remove your key from the igni­
tion while the vehicle's lights are turned
on, a buzzer sou nds as long as the driv­
er's door is open .
- In coo l o r damp weather, t he ins ide of
t h e headlights, turn signa ls and tail
li ghts can fog ove r du e to t he tempera­
tu re diffe re n ce between the inside and
outside. They will cle ar sho rtly after
swi tching them on. This does not affect
t h e service li fe of the lighting . -
In the event o f a light sensor malfunc­
tion, the driver is notified in the instru­
ment cl uster display
c:> page 35 .
Adjusting exterior lighting
The functions are set in the MMI.
• Select: Func tion b utton I CAR !> Con trol but ­
t on
Systems* > Exterior lighting . Or
.. Select: Function button
I CAR !> Con trol but ­
ton
Car systems * > Vehicle settings > Ex te·
rior lighting .
Coming home (Lights when leaving car ),
Leaving home (Light s when unlock ing car )
The coming home f unction ill uminates the
area o utside the vehicle when you tu rn the ig­
nition off and open the driver's door. Depend­
ing on vehicle equ ipment, the f unction can be
switched on and off or the length of t i me the
ligh ts remain on* can be adjusted .
The leaving home illum inates the area outside
the ve hicle when yo u unlock the vehicle . T his
funct ion can be switched on and off .
The Coming home and Leaving home func­
tions only operate when it is dark and the light switch is in the
AUTO pos ition.
Daytime running lights
USA model s: The daytime r unning lights can
be turned on or off using th is function.
Canada model s: Th e fu nction canno t be
tu rned off .
It is activated automatically each
time the ignition is t urned on. This menu item
is shown "greyed out" .
Front fog lights
Fig. 54 Instrument pa nel: light switch

Notes o n these featur es
- The turn signals only work with t he ignition
turned on . T he indicator light s
B or LI in
the instrument cluster¢
page 14 also blink.
- After yo u have turned a corner, the turn sig-
nal switches off automatica lly.
- The
high beam works only when the head­
lights are on. The indicator light
II in the
instrument cluster i lluminates when the
high beams a re on.
- The
headlight flasher wo rks only as long as
you hold the lever -even if there are no
lights turned on . The indicator light
II in
the ins trument clus ter illuminates when you
use the headlight flasher .
A WARNING
-
Do not use the high beam or headlight
flasher if you know that these cou ld blind
oncoming traffic.
Interior lights
Front interior lights
The interior lights include reading lights for
both the driver and the front passenger .
Fig. 59 Headlin er: Fro nt in te rior /re adi ng light s
The rocker switch @¢ fig. 59 for ope rating
the inter ior lighting has the follow ing func­
tions :
Door cont act switch
.,. Place the switch @ in the midd le position.
Interior light switched on
.,. Place the switch @ in posit ion I.
.,,
:! .:,
1A
Clear vision 61
Interior light switch ed off
.,. Place the sw itch @ in position 0.
Re ading light s ~
.,. Press one of the switches @ to turn the
r ight or left reading light on or off .
In the door contact swi tch position (switch @
in the m iddle position), the interior l ights tur n
o n as soon as you unlock the vehicle o r open
the doors . The inte rior lights are also turned
o n when the igni tion key is removed . The light
goes ou t about 30 seconds after the doo rs are
closed. When the veh icle is locked or when
the igni tion is turned on, the i nterior lights
are turned off .
When a door is open, the interior lights are
tu rned off after about 10 minutes to prevent
draining the battery.
T he brigh tness of the lights is cont rolled au­
tomat ic all y by a dimme r when they are
switched on and off.
Rear interior lights
There are reading lights in the rear for the
passengers .
0
...
Fig . 60 Headli ner: Rear read ing lig h ts
>l!i:.
r -
' \,
Fi g. 61 Headlin er: Third row r eading light
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