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i never measured par.. LOL... i just know that when they're browned out... either water params or too much light... it's not that bad... but i would put it in the shade for a while... if you blast it with way too much light, it will bleach... don't know if you're 150 par is a lot or a little... i don't know if you're rocking LED's or t5's... their numbers are very complicated and weird because light doesn't come from one single source...
i miss everyone using metal halides... LOL... everyone had the same par back then...
tip... chalice do way better on the floor... doesn't matter what type of light or par you have... the sand bed is where they belong...