How much light is to much?

[90reef]

I run an Orbit with 4 X130 bulbs on a 90 gallon tank. this is 5.7 watts per gallon. I am seeing bleaching of some corals. Is this 5.7 watts to much light.

 

[f1shman]

no, many people can have up to 10 watts per gallon. the bleaching may be from other thigns.

 

[jjlittle]

5.7 is fine I would agree the bleaching is from something else going on.

 

[dogstar]

How long hve you had those PCs ?

 

[oceana]

we have nearly 9 WPG on ours
BTW WPG is a really crappy way to judge lighting.
it is only usfull when talking about lighting in the most basic of terms.

 

[reefnut]

Did you acclimate the light to the tank?? Any time you increase the lighting you need to acclimate the tank. Back the lights off to about 1/2 normal run time. So if you were running 10hours... start the new lights at 5hours and slowly go up from there over several weeks.
fwiw I have 9.3wpg on my 110g...

 

[reefrocker]

I have 12.37 WPG!! That's on my 75g

 

[minitruck]

I have 11 wpg on my nano and the only thing that showed any signs of bleaching is my brain and a few ricordiea's.