Juhani suggests: Oct 26, 2015 at 3:28 am The issue is the fact you'll want to get the many light to 1cm x 1cm region. I've 100W led (8k lm) but I get more light to screen from single 1k lm Cree XM-L2. 2nd challenge is the slender wavelength pattern https://josueseowg.bloginwi.com/70465932/the-basic-principles-of-change-bulb-epson-projector