Cause you'll bleach your corals. They are not dimmer. They just appear that way to the human eye. It's good to start them out at 30% and increase by 3-5% per week. I switched over fron 2 250W with 4 54w T5s. I've had 4 for a couple of months now and they are now running at a max 55w 60b 65rby. Probably going to keep it like that. I had them turned up alot higher due to impatience and started to have issues with a bit of algae on my sandbed. Several other people who have switched over to the Sols have experienced the same problems.
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