LED efficiency

Usually, when we talk about the efficiency of a light source being x lm/W for
example, I understand that every Watt of input power generates approximately x
lumens.

These lumens are of course energy and can be converted back to power, so the
overall efficiency of the light source can be determined as the ratio (light
energy)/(input energy)

The remainder in conventional light sources, is usually wasted as heat.

What is this difference wasted as in LEDs? Is it also heat?

In other words, if I manage to build a 400W LED arrangement with LEDs which have
efficiency 20 lm/W and if I have a 400W metal halide which has an efficiency of
90 lm/W, which will generate more heat?

Thanks much in advance,
--
I.N. Galidakis --- http://ioannis.virtualcomposer2000.com/
----------------------------------------------------------
"There's ALWAYS a mistake somewhere"

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