*Most* of the white LED's currently on the market are GaN (blue) LED's that illuminate a white-producing phosphor. The chromaticity indices of the resulting light is markedly different than you get from mixing R, G, and B. (Though this probably doesn't matter to anyone for this particular application...) It requires some small modifications, most noticably some way of dealing with the pre-heat current (usually done with a shunting resistor across the LED, though I have also seen schemes where a Zener or lifting a leg of the pre-heat resistor is done.) -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927