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PostPosted: Fri Oct 12, 2007 6:42 am 
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Joined: Thu Aug 23, 2007 3:34 pm
Posts: 178
Location: DENMARK
Hey all.

Here is my DIY helmet light. Had an old Petzl lying around, got a cheap 7Ah sealed lead battery and a 35 W halogen with aluminium-reflector. Makes night day I tell you! Add some velcro and it sits perfectly.

http://picasaweb.google.com/Ostetorben/MTBLygte


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PostPosted: Fri Oct 12, 2007 12:54 pm 
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Joined: Thu Aug 23, 2007 3:34 pm
Posts: 178
Location: DENMARK
Heavy being the battery of course!


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PostPosted: Sun Oct 14, 2007 1:08 am 
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Joined: Fri Dec 23, 2005 5:10 pm
Posts: 237
Location: Inverclyde, Scotland
Nice light.

But watch out. This may run very hot.

I have a 35 watt bar mounted halogen light. It is essentially a heating element which happens to emit a small fraction of energy as light.

My metal bodied lamp sizzles when rain hits it and I have to turn it off when stationary because it overheats when out of an airstream. ( I know this because I can smell burning electric componentry.)

It may melt through your housing, helmet and head. But it is probably worth it. Good luck.

Alan


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PostPosted: Sun Oct 14, 2007 11:15 am 
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Joined: Tue Mar 21, 2006 12:56 am
Posts: 4907
Heavy light - isn't that an oxymoron?


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PostPosted: Sun Oct 14, 2007 12:45 pm 
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Joined: Tue May 02, 2006 12:24 pm
Posts: 566
Location: Prague
2 wheels :no1:

_________________
Ellsworth Truth = 9371g


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PostPosted: Sun Oct 14, 2007 3:38 pm 
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Joined: Thu Aug 23, 2007 3:34 pm
Posts: 178
Location: DENMARK
Heavy ligtht, hmmmm :-)

Regarding the heat, I found out the hard way (smoke and stuff) that I should use a halogen bulp with an aluminum reflektor. These bulps send 80% more heat forward compared to normal bulps (which are apparently called "cold beam" due to their dichroic reflector sending most heat to the back). Tried first with aluminum foil. Bad idea.

But the 35W lights up the night I tell you, will try to make a helmet-cam-holder to make a nice video. Poor animals with their dilated iris in the middle of the night :shock:


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