Why manufacturers don't post PAR read ever? (or ONF lighting problem))
Recently ran into some algae problem once I fiddled with light intensity setting, currently using 60cm ONF flat one...As ONF stated 70 watts for their 60cm, this is always beyond my understanding of LED light, it is way to powerful IMO. I had it 70% for 6 hours before, lately I wanted to try that nature mode which up&own the power slowly supposedly mimic NATURAL light, but it brought algae out. So I started to wondering what is exactly the intensity and Blue-White ratio mean to the actual PAR, thus I literately searched everywhere, I couldn't find anything, only one dude from amazon review that he has a website for PAR study of many nano size read, and he only has a ONF nano.
IF possible, can someone tell me what setting should I have for ONF flat one for a 40 cm height (US 20 gallon)tank? or is there someone done this before. I know a PAR meter is the best to find it out, but the price...or I guess everyone had this question in their mind just don't wanna pay the duty to spend a machine that is only for scientifically measuring light for plants?