Lou wrote:

I'm in the middle of assembling my wings on a wooden airplane, any
reason I can't use hologen car headlights in the leading edge?


Energy is conserved. All of the energy used by a light
becomes heat. The energy that does not become light,
becomes heat locally.

So if you can find the efficiency of the type of light you
are using, subtract that number from one and mulitply that
differance by the wattage for the light. That will tell you
how much heat is going to be dissipated by the light.

E.g:

q = (1 - e)P

That won't tell you the surface temperature of the light,
but it will give you a means of comparing different lights.

E.g. a 1000 watt light operating at 5% efficiency will
dissipate as much heat as a 500 watt light operating at
10% efficiency. If the first has about twice the surface
area of the second then as a first guess they will both
have about the same surface temperature if housed in
similar environments.

BTW, weren't halogen bulbs originally developed for aircraft
landing lights?

--

FF