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**fishscale** · 11-09-2007, 03:32 AM

Are you saying that it should be included in the lamp's efficiency or efficacy? Luminous efficiency is the percentage of light that can be used (i.e. relevant wavelengths), where as efficacy is a measure lumens/watt. (Sorry, just did a presentation on LED lighting).

I don't think this should be included in the lamp's efficacy, because this light is lumens that were generated by the lamp (which is covered by the efficacy), but because it did not stay as light energy, became heat.

11-09-2007, 03:32 AM	#6 (permalink)
fishscale O.G. - original guppy. (View User Tanks) PTrader: (12) Join Date: May 2007 Location: Ann Arbor, MI Posts: 3,712	Are you saying that it should be included in the lamp's efficiency or efficacy? Luminous efficiency is the percentage of light that can be used (i.e. relevant wavelengths), where as efficacy is a measure lumens/watt. (Sorry, just did a presentation on LED lighting). I don't think this should be included in the lamp's efficacy, because this light is lumens that were generated by the lamp (which is covered by the efficacy), but because it did not stay as light energy, became heat. __________________ Eheim Pimp #254, Eheim Wolverine #1 55 Gallon Work in progress 10 Gallon Shrimp Tank 10 Gallon Planted QT 20 Gallon Shrimp Tank (Work in progress)