Depends on the car. On the VW passat 100% sure it's the low beam itself. On other cars like the Lexus RX300 its' the high beam naman, I guess on some other models may dedicated DRL light.
Passat Low Beam vs DRL mode (notice the bulb in use is the same)
You can even open up the cluster, wala talagang ibang bulb for DRL, it's just a matter of controlling the voltage to the light.
Sir. It might be better if you look for the diagram for the OEM DRL. Possibly to replace the wiring harness and check your fusebox. If there is an extra for DRL, it may be possible to upgrade for DRL. If you know someone or website that have the complete parts catalog or workshop manual. You can search there.
AFAIK, Canadian Corollas use their headlamps as DRL's. Don't know about the current model but past models used the high beam filament burning at less than full intensity.
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Sa mga bansa/lugar na nasa upper lattitudes typically require DRL for safety reasons. Imagine at 12:00 NN parang 4:00 or 5:00 PM kung ikukumpira sa atin.
In some places in the US, requires na you turn on your headlights if you turn on your wipers.
mbeige,
The DRL and highbeam use the same filament. But the DRL uses less power (typically 75%-80%).
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Even if most cars are not DRL-equipped I believe it is still a good idea to run with the low-beam headlight on specially during adverse weather and while on an undivided highway. Whenever I drive long distance having my low-beam lights on serves to warn oncoming vehicles and pedestrians of my approach.
guys is it bad po ba kung mag sstart ng sasakyan na naka on yung DRL?
or i-off ko muna DRL upon start?
^ sa amin wala na switch ang drl ng mga sasakyan namin (monty at fd) wala naman nagka-prob so far
pag on palang sir naka ilaw na DRL nyo po? tapos pag start wala naman po problema sa battery po?
ganun na nga bos. automatic sindi na iyong mga iyan kapag nasa "on" position na iyong susi.
mag one year na by the end of the month iyong nasa fd (courtesy of gary q) and hindi pa naman namatay iyong battery maski tapos na iyong warranty ng batt (due for replacement na din pala siya hehe).