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DRL, waste of energy or worth keeping on? #5044369
03/15/19 07:59 PM
03/15/19 07:59 PM
Joined: Apr 2012
Posts: 10,483
Kendall, FL
wemay Offline OP
wemay  Offline OP

Joined: Apr 2012
Posts: 10,483
Kendall, FL
Both our vehicles have automatic headlights, but they only work if you turn the switch to AUTO which also keeps the DRLs on until the sensor detects dimming daylight. I leave the wife's in this mode because well...she may forget. I keep my DRL off and just switch on the headlights as needed. But I look around and every freaking vehicle has lights on during the day. I thought they were initially intended for long single lane, straight stretches of road so oncoming traffic doesn't attempt a pass.

How much energy does it take to leave them in AUTO?


18 KIA Sportage 2.4 AWD
M1HM 10W30, OEM

13 Hyundai Santa Fe Sport 2.0T
PPeL 5W30, OEM
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044375
03/15/19 08:03 PM
03/15/19 08:03 PM
Joined: Oct 2004
Posts: 8,742
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline

Joined: Oct 2004
Posts: 8,742
Cincinnati, OH, USA
They're only running at 1/3 to 1/2 power, so not a lot, but DRL seems to be hard on the bulbs. Not sure if it hurts LED life or not?


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044380
03/15/19 08:06 PM
03/15/19 08:06 PM
Joined: Mar 2014
Posts: 3,802
NJ
Leo99 Offline
Leo99  Offline

Joined: Mar 2014
Posts: 3,802
NJ
I never turn them off. It helps other cars see you. Could save your life one day. I see zero downside to them.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 370,000 miles
2015 Camry 70,000 miles
Re: DRL, waste of energy or worth keeping on? [Re: bullwinkle] #5044385
03/15/19 08:07 PM
03/15/19 08:07 PM
Joined: Aug 2013
Posts: 3,095
Central Maryland
HangFire Offline
HangFire  Offline

Joined: Aug 2013
Posts: 3,095
Central Maryland
Originally Posted by bullwinkle
They're only running at 1/3 to 1/2 power, so not a lot, but DRL seems to be hard on the bulbs. Not sure if it hurts LED life or not?

The high beams on my DRL Corolla last as long as any Halogens I've ever had. Can't say I replace them any more often than the low beams.


Various musings: http://hangfire.net
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044386
03/15/19 08:07 PM
03/15/19 08:07 PM
Joined: Apr 2012
Posts: 6,287
MA
Wolf359 Online content
Wolf359  Online Content

Joined: Apr 2012
Posts: 6,287
MA
Leave them in auto. People are just lousy drivers these days. I heard an accident and then saw the aftermath behind me in a tunnel. Guy sideswiped another car in the lane. It was an older civic which didn't have auto headlamps so I guess the driver was too lazy to actually check their blind side or for whatever reason didn't see the civic in the lane and bounced off him. Heard the bang and then looked up in the rear view mirror and saw the car swerve back into their lane. Pretty much 90% plus of the other cars in the tunnel had auto headlamps and had their lights on. I have the auto headlamps and leave them on auto all the time.

Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044387
03/15/19 08:10 PM
03/15/19 08:10 PM
Joined: Apr 2017
Posts: 1,388
Ohio
hallstevenson Offline
hallstevenson  Offline

Joined: Apr 2017
Posts: 1,388
Ohio
I drive with my full headlights on 24 hours a day. Don't care how much "energy" is wasted doing this either.

Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044388
03/15/19 08:11 PM
03/15/19 08:11 PM
Joined: Apr 2012
Posts: 10,483
Kendall, FL
wemay Offline OP
wemay  Offline OP

Joined: Apr 2012
Posts: 10,483
Kendall, FL
Ok, convinced. I'll just leave them on.


18 KIA Sportage 2.4 AWD
M1HM 10W30, OEM

13 Hyundai Santa Fe Sport 2.0T
PPeL 5W30, OEM
Re: DRL, waste of energy or worth keeping on? [Re: bullwinkle] #5044398
03/15/19 08:16 PM
03/15/19 08:16 PM
Joined: Jan 2009
Posts: 6,800
New England
gathermewool Offline
gathermewool  Offline

Joined: Jan 2009
Posts: 6,800
New England
Originally Posted by bullwinkle
They're only running at 1/3 to 1/2 power, so not a lot, but DRL seems to be hard on the bulbs. Not sure if it hurts LED life or not?


I thought this, too, but my highbeams don't seem to be noticeably affected after 67k miles. You can definitely see some browning of the high-beam bulbs, but they haven't burned-out and the high-beam output seems to be sufficient.


'14 Forester XT FA20DIT (Cobb Stage 1)
Edge 0W-40 + FU filter (64,774 miles)
'15 Legacy FB25 (OEM Stage, uh, neg. 7?)
Edge 0W-20 + FU filter (40,803 miles)
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044399
03/15/19 08:17 PM
03/15/19 08:17 PM
Joined: Sep 2012
Posts: 463
Michigan
NO2 Offline
NO2  Offline

Joined: Sep 2012
Posts: 463
Michigan
According to some studies from the 70's-90's in Canada and Scandinavia, DRL's reduce multi-vehicle accidents as much as 32%, mostly around dawn and dusk and in bad weather. Energy use is minimal since your alternator probably produces excess energy during the daytime.

Last edited by NO2; 03/15/19 08:19 PM.
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044403
03/15/19 08:21 PM
03/15/19 08:21 PM
Joined: Dec 2011
Posts: 5,651
North Carolina
rooflessVW Online content
rooflessVW  Online Content

Joined: Dec 2011
Posts: 5,651
North Carolina
Depends on the car. If it's a halogen, LED, or even D2S bulb, I'm fine with DRLs.

I coded them off in my Phaeton because not only were the D1S bulbs expensive, but the whole stupid front of the car had to come off to change one.


"Zed's dead baby, Zed's dead."
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044404
03/15/19 08:21 PM
03/15/19 08:21 PM
Joined: Dec 2011
Posts: 5,651
North Carolina
rooflessVW Online content
rooflessVW  Online Content

Joined: Dec 2011
Posts: 5,651
North Carolina
Depends on the car. If it's a halogen, LED, or even D2S bulb, I'm fine with DRLs.

I coded them off in my Phaeton because not only were the D1S bulbs expensive, but the whole stupid front of the car had to come off to change one.


"Zed's dead baby, Zed's dead."
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044407
03/15/19 08:23 PM
03/15/19 08:23 PM
Joined: Mar 2017
Posts: 8,199
...
PimTac Offline
PimTac  Offline

Joined: Mar 2017
Posts: 8,199
...
Mine are on as soon as I start the engine. It doesn’t matter which position the light switch is in.


Cannot see signatures any longer so it doesn’t matter.
Re: DRL, waste of energy or worth keeping on? [Re: rooflessVW] #5044423
03/15/19 08:34 PM
03/15/19 08:34 PM
Joined: Apr 2012
Posts: 6,287
MA
Wolf359 Online content
Wolf359  Online Content

Joined: Apr 2012
Posts: 6,287
MA
Originally Posted by rooflessVW
Depends on the car. If it's a halogen, LED, or even D2S bulb, I'm fine with DRLs.

I coded them off in my Phaeton because not only were the D1S bulbs expensive, but the whole stupid front of the car had to come off to change one.


Yeah, but Xenons last a lot longer than halogens. I'm still running the original set on my 2008.

Re: DRL, waste of energy or worth keeping on? [Re: Wolf359] #5044430
03/15/19 08:42 PM
03/15/19 08:42 PM
Joined: Dec 2011
Posts: 5,651
North Carolina
rooflessVW Online content
rooflessVW  Online Content

Joined: Dec 2011
Posts: 5,651
North Carolina
Originally Posted by Wolf359
Yeah, but Xenons last a lot longer than halogens. I'm still running the original set on my 2008.

Like I said, depends on the car.

HID bulbs do also degrade over time. You might be surprised what a new bulb would do for you.


"Zed's dead baby, Zed's dead."
Re: DRL, waste of energy or worth keeping on? [Re: wemay] #5044434
03/15/19 08:45 PM
03/15/19 08:45 PM
Joined: Dec 2006
Posts: 8,367
Canuck living in California
KrisZ Online content
KrisZ  Online Content

Joined: Dec 2006
Posts: 8,367
Canuck living in California
In Ontario Canada the DRLs are mandatory, so both of my cars have it and I can't turn them off. Both are hallogen and they last normal amount of time. I'm yet toreplace one on my 15 GC and on my Mazda it seems every three years, or so seems to be the norm.

The added visibility is definitely worth it IMO.

Last edited by KrisZ; 03/15/19 08:45 PM.

2015 Grand Caravan 3.6L - 31k miles.
2006 Mazda 3 2.0L - 171k miles
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