Sativied
Well-Known Member
So, you are pretengineering (while parroting Supra's posts) that lumens alone doesn't make a good comparisson, because efficiancy matters? Did you really need to quote me for that, so blatantly out of context again, bolding part of a quote I quoted... I never suggested a comparison on lumens alone was the way to go, one of your led buddies here recommend that light that made the comparison.
The lumen output listed by phillips for the DE is according to Phillips, as I posted in the past, the output in the PAR region. We already established there are reflector losses. And the ballast reducing efficiency by using more wattage is another factor that influences efficiency ratings. The output however is not a result of efficiency numbers (ledlogic), the input and output determine the efficiency numbers (reality), which is irrelevant when comparing merely the output.
You basically create your own specific context in which it would be stupid to compare lumens, while in many more realistic and practical situations comparing lumens can still be useful and make other comparisons unnecessary. For example when led companies make skewed lumen comparissons... It will on its own obviously not be useful to make a comparisson in terms of efficiency, regardless of how you quantify or calculate it as that obviously requires more than one input parameter.
Yeah it sure is stupid to compare just the lumen output between HPS and Cree IF you only care about efficiency and efficiancy. "If both lighting devices were 100% efficient"... another very big hypothetical IF.It's stupid to compare the lumen output between HPS and Cree led cobs since HPS has a higher LER and would have a much higher lumen output if both lighting devices were 100% efficient.
The lumen output listed by phillips for the DE is according to Phillips, as I posted in the past, the output in the PAR region. We already established there are reflector losses. And the ballast reducing efficiency by using more wattage is another factor that influences efficiency ratings. The output however is not a result of efficiency numbers (ledlogic), the input and output determine the efficiency numbers (reality), which is irrelevant when comparing merely the output.
You basically create your own specific context in which it would be stupid to compare lumens, while in many more realistic and practical situations comparing lumens can still be useful and make other comparisons unnecessary. For example when led companies make skewed lumen comparissons... It will on its own obviously not be useful to make a comparisson in terms of efficiency, regardless of how you quantify or calculate it as that obviously requires more than one input parameter.