All flouro tubes produce less output as they age. That's a given. Since fixtures don't have an hour meter on them to measure run time, do you: measure your fixtures output with a lightmeter and replace (tubes) when it drop below a percentage of full output; replace on a periodic basis; replace when the fail to strike? Just bought some used Divas and purchased some new spare tubes. I wondering if I shouldn't just re-lamp them, as I have no idea how much use they've gotten.
Life expectancy of Kino biax tubes
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