Too much light??

[Myka]

Agreed. No such thing as too much light, just poor acclimation practises.

Originally Posted by StirCrazy

if you acclimate the coral to the new light properly, then no there is not such a thing as to much light, no matter what we do we will never come close to what the sun lays down on a reef.

If you bleach a coral don't throw it out as it will come back, but if you have proper water flow and use proper techniques to introduce your new light then you won't have a problem.

Steve

[Reefer Rob]

Even Acropora can get too much light. If I try to go too long of a photo-period with 400w lights, some acros lighten, and stop growing...even with a long acclimation period.

[StirCrazy]

Originally Posted by Reefer Rob

Even Acropora can get too much light. If I try to go too long of a photo-period with 400w lights, some acros lighten, and stop growing...even with a long acclimation period.

what kinda 400 watts you using? the Iwak (can't remember the spelling) had a tendency to lighten up corals, but I think it was from there spectrum not the intensity.

my reason for thinking this is my old light design put out 22% more PAR than the 400 Iwak but instead of it being at 6500K it was at 12300K.

Initialy things slowed down but after a week, my colors went deeper, growth exploded, in everything from mushrooms to SPS. I had to get rid of about 30lbs of live rock as my tank was being taken over by mushrooms.

Steve

[StirCrazy]

Also another thing to note, I have never been a fan of 400 watt bulbs, I think unless you have a tank that is 30" or more deep they are a waist of power, especialy when you can do a proper 250 watt HQI/Mogal set up that puts out more Par.

Steve

[Canadian]

Steve,

If you read the article I posted you would be aware that while "too much light" won't fry the coral it will certainly lead to photoinhibition. I don't see any point in providing more light than the organism can use unless the intention is to cause some potential color shifts.

What I've reported is not based on anecdotal experience or assumptions but is based on relatively sound research.

[StirCrazy]

Originally Posted by Canadian

Steve,

to cause some potential color shifts.

exactly.

[Canadian]

The italics around potential were lost in your quote Steve - and the research on PAR levels affecting coloration are equivocal with some showing that lower PAR produces greater fluorescence.