Pierre, I was counting 10W as being the energy in the visible part of the spectrum (most of the 90W is in the infrared, though a little might be in the untra-violet part of the spectrum, depending on the light bulb concerned).
----- Original Message ----- From: "Pierre Abbat" <[EMAIL PROTECTED]> To: "U.S. Metric Association" <[email protected]> Sent: Saturday, March 11, 2006 11:37 AM Subject: [USMA:36247] Re: heat vs. light was diesel > On Saturday 11 March 2006 05:28, Martin Vlietstra wrote: > > On the other hand a light bulb produces 100W of light (or rather 10W of > > light and 90W of heat) regardless of how long it is on. > > Does it produce 6830 lumens, or are you counting 10 W total electromagnetic > energy, including infrared? > > phma >
