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Originally Posted by BrainVat
PPFD isn't the same as intensity though, and many of those graphs do tell a tell of increased intensity given off by DE bulbs. PPFD is the most typically used index for photosynthesis because it occupies regions of the action spectrum for chlorophyll. A higher PPFD rating is not the same as saying that a bulb is more intense.
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Um I thought we were talking about higher light output all together as in PAR or usable light. why would I care if a light is more intense if its PAR is lower? doesn't make sense. the big selling point of DE's by any store is they make more money selling them. first you spend a lot for the housing 446.00 as apposed for a reflector, socket, cord at 150.00 for a SE bulb and then the replacment bulbs are a higher cost for something that requires less material and manufacturing to produce, so I imagine the profit margin is higher.
Steve
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