On Oct 30, 2009, at 11:07 AM, Jeffrey Hergan wrote: > Oi! > > I'm building a green building. It has passive/solar/thermal heating, > a cistern, etc. No electric. > But I need light. > > Actually, what I need is 300 watts of light available at the flick of > a switch. > > So: I'll use a solar collector. > Connect it to a rechargable battery (or batteries). > And run the lights off the batteries. > > The question: I know that I need 300 watts of light. But I can't > figure out how to translate that into LED lingo. > > What sort of LED bulb/fixture would I need to produce the light that a > 100 watt bulb would emit?
So wiki says that a 100 watt bulb puts out more or less 1,700 lumens. (17 per watt) A 50W White LED Flat Lamp Light (18V~20V/ 1700 Lumens/ 2.5A) Seems to put out the same number of lumens running in the 18-20 volt range.. so battery is possible. $131.00 though... ouch! http://www.nrebate.com/en/50w-white-led-flat-lamp-light-18v20v-1700-lumens-25a.html?language=en¤cy=USD over here I see one that plugs into a standard 110v light socket, uses 10 watts but only puts out 400 Lumens (though they say it is the same amount of light as a 100 watt bulb, I assume they mean that in the "focused" direction..) This might be useful if you choose to run the batteries through an inverter (12VDC in 120VAC out) http://www.betterlifegoods.com/ProductDetails.asp?ProductCode=LED-CAT21417 You lose efficiency with the conversion, but gain the ability to use 110v powered stuff.. Sadly there is still no free lunch.. Hope that helps some.. Chuck _______________________________________________ OSX-Nutters mailing list | [email protected] http://lists.tit-wank.com/mailman/listinfo/osx-nutters List hosted at http://cat5.org/
