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Sorry if this has been asked and answered, I did scroll through several pages. I just bought a Ushio 20k 250E DE bulb. I'm trying to get PPFD values for it from Sanjay's site. Is it the same bulb as the Giesemann 250W Blue (58 w/M80) or the other Giesemann 250W 20k (43) which seems to be the same as the HIT (BLV)20K bulb? Or is it something different?
I have a shallow tank (18" plus 4" of sand) and have been running a phoenix 14K. My corals have been bleaching a little; I want to try a lower intensity bulb or a while to see what happens. I just fired up the ushio and it definitely appears less bright, and a little "bluer" and less "purple." I know thing will change as it gets burned in. My main queston is, do I now have a bulb which tests at 58PPFD or 43? My ballast is the PFO HQI.
Thanks!!
Matt
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