LED headlamp replacement bulb?

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Feb 2, 2016 | 04:40 PM

#21

Owtlaw

Road Warrior

Joined: Oct 2011

Posts: 1,376

Likes: 36

From: Round Rock, TX

Quote:

Originally Posted by Hey Man

When you say "reflector" are you talking about the mirror in the housing behind the bulb or the cuts in the glass in front of the bulb?

Probably both are used. Reflector housing, I should have said.

Feb 2, 2016 | 04:43 PM

#22

Owtlaw

Road Warrior

Joined: Oct 2011

Posts: 1,376

Likes: 36

From: Round Rock, TX

Quote:

Originally Posted by 98hotrodfatboy

The led h4 headlamp bulb i purchased is from a USA vendor for $24.00. EBAY, Got it in 3 days. Haven't tried it yet but when i do i will post the results... The fan is in front of the leds which I would think would work better but not really sure. I haven't seen any that have the fan on the rear but I was wondering if the fan is on the outside how will it cool the leds?

Like in a computer, the heat sink takes the heat away from the chip, and the fan cools the heat sink by blowing cooler air across and speeding the heat exchange. I imagine the heat sink on the rear mounted fan models spans from the inside of the housing to the outside. Mounting the fan inside would seem to be pretty inefficient. Would have to build up heat.

Feb 3, 2016 | 09:36 AM

#23

larsfum

Stellar HDF Member

Joined: Jan 2009

Posts: 2,578

Likes: 463

From: On a Lake, not far from the Gulf

Quote:

Originally Posted by Uncle G.

I've been looking at these LED lamps for both the bike and the car (both take the same bulb. My concern is that the fan or heat sink on the back makes the use of the stock rubber weather seal between the bulb and the lamp housing impossible to use. How do you keep rain water out of the lamp housing and the cooling fan?

I think you could mount the boot first, then the bulb. It is a real tight fit. I gave up after a while. What I did was cut the boot, put it on, and rubber cement a patch from an inner tube over the cut.

Feb 3, 2016 | 11:38 AM

#24

Uncle G.

Seasoned HDF Member

Joined: Jun 2010

Posts: 9,332

Likes: 3,873

From: Upstate New York

Quote:

Originally Posted by larsfum

That's sort of what I was thinking would be necessary. I'm not willing to sacrifice a rubber boot I may not be able to replace if it doesn't work out.

Feb 3, 2016 | 11:40 AM

#25

Uncle G.

Seasoned HDF Member

Joined: Jun 2010

Posts: 9,332

Likes: 3,873

From: Upstate New York

Quote:

Originally Posted by 98hotrodfatboy

That's a setup I've not seen before. All the other LED bulbs I've seen have either a big fan or a big heat sink BEHIND the bulb, outside the headlamp housing, and a pigtail to connect the bulb to the headlamp connector, since the connector no longer fits the rear of the "bulb". I question how long such a tiny fan would last, though.