Glad to hear you figured it out!
There is a big thread on RC about how quickly PAR levels drop off and with what bulbs. I think it was pretty much determined that the biggest drop was after a few months and then the next year was pretty minimal.
I would have to go back and read (too lazy) but in the first 3 months, most bulbs dropped to like 70% and then a year later were around 65%. Or somewhere around those numbers anyways. One guy tested for 1.5 years and was still at 60% of the original output and stayed there until the burned out.
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