65W headlamp... how to handle the heat?

[Gustaf Haag]

Hi

I could need some feedback on my plans for a new headlamp.

As battery-pack i have selected this prewired pack containing 16 Li-Ion cells with 2 PCBs. Together they perform a 10,4 Ah battery pack on 14,8 V.

Link to the product:
http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=3065

The Osram Halostar IRC 65W will be my bulb. It is a 12 V halogene with the IRC technology performing 1700 lumens.

Link to the product:
http://www.energiesparshop24.de/Ene...M-Halostar-IRC-|-GY-635-|-12V-|-65W::330.html

Using 14,8V on this 12V bulb will increase it's performence by 190% to over 3000 lumens. The IRC-bulbs are longlife with aprox 4000h lifetime, reducing this to 200h (5%) is not a problem.

Se graph below which i have based my calculations on:
http://www.myra-simon.com/bike/images/lamplife.gif

65W/14,8V = 4,4 A
This batterypack (10,4 Ah) will work for over 2 hours performing over 3000 lumens!

Summary:
Batterypack: li-ion 10,4Ah 14,8V
Bulb: Osram Halostar IRC 65W 12V

Output: 3000 lumens
Life: 2 hours

Is this reality? Please correct any errors in my calculations! And how shall i deal with the heat?

 

[missionaryman]

it's a reality - in fact you can even add more voltage to the lamp for even more light and even more heat.
I'm guessing that being a headlamp you are either riding or climbing both of which need light weight.
To sheil that heat from a plastic helmet you need lots of mica and kevlar or something like that - you'll set the news paper on fire if you read it too close

 

[TMorita]

Hi

I could need some feedback on my plans for a new headlamp.
...
Output: 3000 lumens
Life: 2 hours
...

I would recommend a good pair of sunglasses when wearing that headlamp.

Toshi