bosgrowercommentedweek 16 years ago
@Smowkabowl,A couple of thoughts on the fixture. Perfect Sun is a bit closed mouth on testing and actual performance. Another owner wanting to upgrade it with better COBs identified the CREE COBs as the cxa2520 series. Here's the link if you're interested https://ledgardener.com/forum/viewtopic.php?t=563. Since the dimensions are 22 x 15, the 1200 μmols they claim may be a bit misleading. You may get that under the center of the fixture but it will decrease rather quickly as you expand that rectangle to the limits of your tent.
Even with a 4x4 tent, if you lower the light to 18" as they suggest in late flower, plants not directly under the light are going to get far less photons than those directly under the light and you may even get some bleaching in the center of the fixture.
While the following is not an equivalent example, look at the Spectrum/PAR tab and you will get the general idea. https://www.mars-hydro.com/led-grow-light/mars-pro-ii-led-grow-light/buy-marspro-ii-1200w-cree-256-led-grow-light-home-and-commercial-grows-for-sale.
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