boxfishpooalot Active member Sep 11, 2006 #2 The easy way is just replace florecent every 6 months, and halides every year. Otherwise you can buy a 100-200$ lux meter. Which measures lux(light output). Or a spectrometer to measure spectrum, but thats very confusing.
The easy way is just replace florecent every 6 months, and halides every year. Otherwise you can buy a 100-200$ lux meter. Which measures lux(light output). Or a spectrometer to measure spectrum, but thats very confusing.