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What about the old saying the brighter the animal the less light it needs? Is this the case on sponges?
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Usually the brighter pigmented cnidarians come from shallower waters and require, or are used to more light. I'll have to do a bit of reading and get back to you on whether or not this holds true for the any species of sponges. My initial skimming indicates that little is known about pigmentation but that protection from solar radiation and warning colouration have been suggested. They are very interesting animals for sure. Maybe some of the people who've tried them will chime in.
As for reading I'll dig through
Invertebrate Zoology and see if I can come up with anything for you.