10W/20W High Power White LED

[Ioannis]

I don't know what are "those" LEDs you my mean, but what I have tested so far in the range of 80 Watts is disappointing in the sense of efficiency.

I think you have to look for the ratio lumen/watt and this should be as high as possible. A number of 65-70 is good enough.

The two module I tested, consumed at 31,8Volts about 4,8A and this gives the equivalent light of a halogen about the same power (150Watts) and with the necessity to use about 1 sq. meter heatsink.

So I do not think this is easy to use. When the efficiency rise at higher level sure LED will be widely used everywhere.

Recent announcements from Cree and Lumileds show that the 100 lumen/watt is near or done (http://www.philipslumileds.com/produ...on-rebel-white).

Ioannis