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Quick bulb changing question

Kevin McG

Ni Hao!
I don't have the time to do any searching :o
I just changed my bulbs from a 14k phoenix to a 10k xm. I was running the light about 8" off the water and I raised it another 4" to about 12",is this enough?

Also, I was running the light 7-8 hours per day, what should I cut the lighting cycle to?

I was thinking 4-5 hours for a week, then 6-7 for another week :rolleyes:
 
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