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 Post subject: LED lamp housing aero?
PostPosted: Wed Dec 20, 2006 8:41 am 
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Joined: Thu Sep 14, 2006 8:48 am
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Location: mid michigan
How much drag could a lamp like the one in the pic add if it were mounted somewhere on the nose of the car? http://www.teamswift.net/album_pic.php?pic_id=10451

I converted some incandescent marker lamps to high output leds and wanted to use them in place of my dim high current stock markers. I know it would be better aero if the leds were in the stock lamp housing, but I didn't want to mess with the blinker flasher and I can still use the stock lights if I want. Anyways, I don't want to add so much drag that it cancels any power savings they give.
This picture shows one of the amber front ones lit up.
http://www.teamswift.net/album_pic.php?pic_id=10452

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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 Post subject:
PostPosted: Wed Dec 20, 2006 1:35 pm 
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Joined: Mon Jun 06, 2005 8:19 pm
Posts: 274
Location: Vancouver
I'm no expert but I can't see that resulting in any noticeable increase in drag if you're mounting it similar to what you have in the first pic. Just a question though, why don't you just buy high output led replacement bulbs? :huh: that way you don't have to mess with anything... just pull the old ones out and replace with new high output leds. I'm not trying to be a jerk, just wondering. :dunno:


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 Post subject:
PostPosted: Wed Dec 20, 2006 2:40 pm 
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Joined: Thu Sep 14, 2006 8:48 am
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Location: mid michigan
I'm too cheap :lol: . I only have a few bucks into each one (vs $10 or more for plug in led bulbs) and I could tailor the output to my liking. Plus the whole blinker flasher issue adds to it. Also I would have to order the special 90 degree led cluster to work well in the front markers. I think my front ones will be higher visibility too because the center bright white LED is a narrow beam like a projector beam and the two amber ones are high flux 100 degree angle beams for off axis visibility. Mine may be more energy efficient too, drawing 70ma each in front and 55ma each in back (the back ones just use 2 high flux reds each). In other words cheaper and better (except for having to mount them) plus it's fun to DIY :D .

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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 Post subject:
PostPosted: Thu Dec 21, 2006 1:59 am 
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Joined: Mon Jun 06, 2005 8:19 pm
Posts: 274
Location: Vancouver
jwxr7 wrote:
I'm too cheap :lol: . I only have a few bucks into each one (vs $10 or more for plug in led bulbs) and I could tailor the output to my liking. Plus the whole blinker flasher issue adds to it. Also I would have to order the special 90 degree led cluster to work well in the front markers. I think my front ones will be higher visibility too because the center bright white LED is a narrow beam like a projector beam and the two amber ones are high flux 100 degree angle beams for off axis visibility. Mine may be more energy efficient too, drawing 70ma each in front and 55ma each in back (the back ones just use 2 high flux reds each). In other words cheaper and better (except for having to mount them) plus it's fun to DIY :D .




Fair enough :)


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 Post subject:
PostPosted: Wed Jan 03, 2007 8:45 am 
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Location: mid michigan
I got them installed and wired :D . I ended up putting the front ones down lower than the first image I showed above. I have a seperate toggle for the front and one for the rear for maximum versatility. Light conditions let me use them by themselves quite a bit.

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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 Post subject:
PostPosted: Wed Jan 03, 2007 7:46 pm 
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Joined: Thu Sep 14, 2006 8:48 am
Posts: 124
Location: mid michigan
The back red ones seem like they could be too bright. I will probably change to a higher value resistor so they don't look like I have my brake lights lit.

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jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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PostPosted: Tue Sep 29, 2009 7:51 am 
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Joined: Thu Sep 14, 2006 8:48 am
Posts: 124
Location: mid michigan
I've been driving with these LED lights on constantly for almost 3 years. This morning I noticed the front ps lamp assembly has issues with the 2 amber LEDS inside. I'll have to see what happened.

_________________
jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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PostPosted: Wed Sep 30, 2009 7:33 am 
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Joined: Thu Sep 14, 2006 8:48 am
Posts: 124
Location: mid michigan
The two amber LEDs are in a series circuit and one of them went bad. I replaced the bad one and it's back to normal.

_________________
jamie
94 geo metro 1.0L 3cyl 5speed, 4 door hatch
best tank, 81.22 U.S. mpg
90 day ave, 69.23 U.S. mpg
longest range on 1 tank, 790 miles
(click below to see more info on my car, including a gas log)
http://www.gassavers.org/garage/view/272


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