LED Headlights: Hiw Many Watts? - Page 2 - Rennlist - Porsche Discussion Forums

Notices
924/931/944/951/968 Forum
Sponsored by:
Sponsored by:

LED Headlights: Hiw Many Watts?

Old 01-04-2019, 02:59 PM
  #16  
Jfrahm
Addict
Rennlist Member

 
Jfrahm's Avatar
 
Join Date: Mar 2002
Location: Boulder, CO
Posts: 5,691
Default

Originally Posted by V2Rocket View Post
LEDs can be voltage sensitive sometimes, the stock 944 wiring harness might put 10V at the H4 plugs.
Hmm, maybe with the tungsten lamps in-circuit you might see a reading like that, but if you had 10V at that connector otherwise the car's wiring and/or switchgear is wrecked. I'd expect to see less than 0.3v drop at that connector.
Jfrahm is offline  
Old 01-04-2019, 06:22 PM
  #17  
screamin94Z
User
 
Join Date: Dec 2005
Location: Halfmoon, NY
Posts: 127
Default

The voltage at my headlight socket is 1.2V lower than battery voltage with the stock wiring in good condition.
screamin94Z is offline  
Old 01-05-2019, 12:55 PM
  #18  
snb13
User
 
snb13's Avatar
 
Join Date: May 2010
Posts: 676
Default

Years ago I put in the Rennbay harness and Hella E-code housings for H4 lamps. It was a great upgrade. However, I was replacing the lamps annually--and not cheapy lamps, either. I drive in both urban & rural settings, often at night and often not in a straight line. I can say without a doubt, putting the LED H4 lamps I chose, in the E-code housings with Rennbay harness, was yet another upgrade. YMMV
snb13 is offline  
Old 01-05-2019, 01:56 PM
  #19  
lamrith
User
 
lamrith's Avatar
 
Join Date: Jun 2018
Location: Tacoma, WA
Posts: 125
Default

Originally Posted by snb13 View Post
Years ago I put in the Rennbay harness and Hella E-code housings for H4 lamps. It was a great upgrade. However, I was replacing the lamps annually--and not cheapy lamps, either. I drive in both urban & rural settings, often at night and often not in a straight line. I can say without a doubt, putting the LED H4 lamps I chose, in the E-code housings with Rennbay harness, was yet another upgrade. YMMV
Which LED's did you end up going with?
lamrith is offline  
Old 01-05-2019, 02:27 PM
  #20  
snb13
User
 
snb13's Avatar
 
Join Date: May 2010
Posts: 676
Default

Originally Posted by lamrith
Which LED's did you end up going with?
Cougar Motor LED Headlight Bulbs All-in-One Conversion Kit - H4 (9003 Hi/Low) -7,200Lm 6000K Cool White CREE - 3 Year Warranty
Amazon Amazon
snb13 is offline  
Old 01-05-2019, 03:04 PM
  #21  
lamrith
User
 
lamrith's Avatar
 
Join Date: Jun 2018
Location: Tacoma, WA
Posts: 125
Default

Originally Posted by snb13 View Post
Cougar Motor LED Headlight Bulbs All-in-One Conversion Kit - H4 (9003 Hi/Low) -7,200Lm 6000K Cool White CREE - 3 Year Warranty https://www.amazon.com/dp/B01H6NZ5QW..._ZIomCbGE22FWT
Thanks! Any issue with radio interference? I put LED's on my mustang and when headlights are on FM reception is terrible and full of static.
lamrith is offline  
Old 01-06-2019, 12:43 AM
  #22  
snb13
User
 
snb13's Avatar
 
Join Date: May 2010
Posts: 676
Default

Originally Posted by lamrith
Thanks! Any issue with radio interference? I put LED's on my mustang and when headlights are on FM reception is terrible and full of static.
No issues at all.
snb13 is offline  
Old 01-06-2019, 10:06 AM
  #23  
V2Rocket
Rainman
Rennlist Member
 
V2Rocket's Avatar
 
Join Date: Jan 2007
Location: Rancho Cucamonga, CA
Posts: 42,162
Default

I'm surprised those work for you - I tried similar in my H4 Subaru and it just made 2 splotches of light rather than a full "beam".
V2Rocket is offline  
Old 01-08-2019, 03:22 AM
  #24  
snb13
User
 
snb13's Avatar
 
Join Date: May 2010
Posts: 676
Default

It all depends on the housing, I believe. I put them in an '06 F250 and was unimpressed. Took the LED lamps from the F250 when I sold it and put them in our Flex--great. I also put similar ones in a Isuzu Trooper. Big improvement.
snb13 is offline  
Old 01-08-2019, 06:44 AM
  #25  
MAGK944
Addict
Rennlist Member
 
MAGK944's Avatar
 
Join Date: Jun 2007
Location: Palm Beach, Florida
Posts: 5,088
Default

Originally Posted by snb13 View Post
Years ago I put in the Rennbay harness and Hella E-code housings for H4 lamps. It was a great upgrade. However, I was replacing the lamps annually--and not cheapy lamps, either. I drive in both urban & rural settings, often at night and often not in a straight line. I can say without a doubt, putting the LED H4 lamps I chose, in the E-code housings with Rennbay harness, was yet another upgrade. YMMV
Originally Posted by snb13 View Post
It all depends on the housing, I believe. I put them in an '06 F250 and was unimpressed. Took the LED lamps from the F250 when I sold it and put them in our Flex--great. I also put similar ones in a Isuzu Trooper. Big improvement.
That's surprising, e-code housings are made to distribute more of the light forward rather than to the sides, it’s something to do with traffic signs in Europe being lit whereas in the US they are not. Anyway because of that, I’d have thought LEDs, which also don’t have a wide spread or beam, would be worse in e-code housings. More forward light granted, but exasperating the fact that they weren’t adaptive but reducing side visibility and turn-in lighting drastically.
MAGK944 is offline  
Old 01-08-2019, 03:21 PM
  #26  
bureau13
Addict
Rennlist Member
 
bureau13's Avatar
 
Join Date: May 2014
Location: South Florida
Posts: 2,942
Default

I don't think that's true about visibility to the side? At least...I've never heard that, and the H4 lenses have a clearly-defined upper cutoff that does NOT apply to light cast to the passenger side...it is deliberately shining light to that side and higher.
bureau13 is offline  
Old 01-08-2019, 05:46 PM
  #27  
MAGK944
Addict
Rennlist Member
 
MAGK944's Avatar
 
Join Date: Jun 2007
Location: Palm Beach, Florida
Posts: 5,088
Default

Originally Posted by bureau13 View Post
I don't think that's true about visibility to the side? At least...I've never heard that...
Sure is, they also mention it on the e-code product page on Rennbay. The reason is that Euro road signs are illuminated so there is no requirement for light to be spread to the side to see the signs, whereas US road signs are not illuminated and rely on vehicle headlights to illuminate them. It doesn’t affect the cut-off as the light spread is on the sidewalk side of the car not the oncoming traffic side. There’s more info on this ancient website Headlight Services

Last edited by MAGK944; 01-08-2019 at 06:06 PM.
MAGK944 is offline  
Old 01-08-2019, 06:24 PM
  #28  
bureau13
Addict
Rennlist Member
 
bureau13's Avatar
 
Join Date: May 2014
Location: South Florida
Posts: 2,942
Default

That's the part that confuses me though....the sharp cutoff is clearly relaxed on the side, allowing light to do exactly as you said it wouldn't do. I assumed that was why it was that way, but your statement about road signs seems to indicate otherwise.

Ahh, here we go, from the Headlight Services site linked above:

"The European standard allows all the light to go on the road - they have a law that any overhead or roadside sign has to have it's own, independent lighting or must be highly reflective. So not only is there more light on the road with your low-beams, the high-beams are more precise as well. There is also a triangle of light on the right side to light up roadside signs."

I suppose if you have unlit overhead signs, your ability to see them might be marginally reduced, but my experience, and the text above, suggest signs on the side of the road are generally fine.

One caveat is that I live in such a well-lit area that I could probably do just fine with my headlights off in most places (and many drivers accidentally do, which drives me nuts, but I digress). It's possible that in less well-lit areas, this is something one might notice.
bureau13 is offline  
Old 01-08-2019, 06:45 PM
  #29  
MAGK944
Addict
Rennlist Member
 
MAGK944's Avatar
 
Join Date: Jun 2007
Location: Palm Beach, Florida
Posts: 5,088
Default

Originally Posted by bureau13 View Post
...I suppose if you have unlit overhead signs, your ability to see them might be marginally reduced, but my experience, and the text above, suggest signs on the side of the road are generally fine...
Yes except that wasn’t my point. The e-code lenses focus all of the light towards the front, LEDs focus all the light towards the front, therefore LEDs in e-code housings will reduce side vision which degrades turn-in lighting. That is why all car manufacturers use an adaptive system when they use LEDs, the adaptive system takes inputs from steering and pitch to aim those LEDs to restore the light when the car hits a dip, brakes or steers left and right. I doubt very much they would go to that expense if they thought non-adaptive LEDs alone provided sufficient safety.

MAGK944 is offline  
Old 01-09-2019, 02:31 AM
  #30  
944Time
User
 
944Time's Avatar
 
Join Date: Apr 2005
Posts: 122
Default

Originally Posted by V2Rocket View Post
get the highest W you can, but even with LED lights you should add a Rennbay headlight relay harness to get full voltage at the bulbs.

You don't need that for LED bulbs. An incandescent bulb will vary in brightness depending on the applied voltage.

But LED bulbs are not like incandescent bulbs. They have a constant-current driver which will feed the LED with a constant current, regardless of voltage.

In addition, LED bulbs draw about 1/5th the current of incandescent bulbs. So a "100W equivalent" LED bulb will draw 20W or so.
944Time is offline  

Thread Tools
Search this Thread

Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: