Hello,
I thank you all for hanging out in an odd world.
I wish to build a variable beam and dimmable light using LEDs as a lightsource, that has an equivalent luminance output to a focused 250w + Halogen. I am a photographer and filmmaker, and I often need a good portable source of light, and for some reason I am always attracted to the DIY approach to innovation rather than the purchase of an expensive dedolight, or equivalent.
My thoughts were moving towards the use of a large LED array, using mirrors to narrow the beam of the array, into a mirrored box (a system used photographically to uniform a lightsource), which would then output through a condensing lens. My thoughts suggest that the mirrored box should contain a short focal fresnel facing the condenser which, ideally, would be a long focal fresnel (though they are hard to find).
Do any of you have any pointers, or possible suggestions that might reduce the complicity of the design, or shall i post a drawing? I guess i am looking for a beam that can be adjusted between about 20 and 60 degrees, and can produce as much light as possible. I am not too worried about power consumption, as my other alternative would be a 24v 250w halogen, which would burn more power and have more heat to dissipate.
Many thanks,
Tobias
I thank you all for hanging out in an odd world.
I wish to build a variable beam and dimmable light using LEDs as a lightsource, that has an equivalent luminance output to a focused 250w + Halogen. I am a photographer and filmmaker, and I often need a good portable source of light, and for some reason I am always attracted to the DIY approach to innovation rather than the purchase of an expensive dedolight, or equivalent.
My thoughts were moving towards the use of a large LED array, using mirrors to narrow the beam of the array, into a mirrored box (a system used photographically to uniform a lightsource), which would then output through a condensing lens. My thoughts suggest that the mirrored box should contain a short focal fresnel facing the condenser which, ideally, would be a long focal fresnel (though they are hard to find).
Do any of you have any pointers, or possible suggestions that might reduce the complicity of the design, or shall i post a drawing? I guess i am looking for a beam that can be adjusted between about 20 and 60 degrees, and can produce as much light as possible. I am not too worried about power consumption, as my other alternative would be a 24v 250w halogen, which would burn more power and have more heat to dissipate.
Many thanks,
Tobias