Juhani claims: October 26, 2015 at 3:28 am The trouble is usually that you have to get all of the light to 1cm x 1cm space. I've 100W led (8k lm) but I get more light to screen from single 1k lm Cree XM-L2. Next difficulty is the slender wavelength pattern of any led. The color wheel in DLP projector dimms the light all the more.In the lamp earth,