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Originally Posted by StirCrazy
Quote:
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Originally Posted by Bob_I
when I actually measured the lumen output I found a decrease of 50% at six months. That to me was unacceptable.  |
thats horable Bob, out of the 8 PC's I have has the wose was 12% at 6 months and 22% at 1 year. I found that at about 16 months they drop again sharply.
Steve |
Maybe it depends on the bulb or the ballast overdriving/underdriving the bulb? When I had 55W GE9325K bulbs running on the Workhorse ballast, there was a very noticeable decrease in visual light after 6 months. My purple cap would turn brown by the 6 month mark and would turn purple again again changing bulbs.
As for Actinics, I measured my dissolved oxygen levels with only the 95W VHO Actinics powered on. There was very little increase in oxygen which leads me to conclude that not much photosynthesis was going on under 95W of Actinics. There was slightly more DO under the 96W 50/50 bulb. And of course, there was significantly more under the MH.