Yup, for actinic supplementation LEDs are second to none. The royal blue ones really make the corals pop.
As for running these at 3W I would suggest not to. As you mentioned heat is the killer of LEDs. These are enclosed and passively cooled and that is why they are underdriven. They would probably burn out quickly if run at 3W. So unless he can open upo the housings somehow and add a bunch of fans to cool them I would leave them running as is. If somebody something that runs at higher power but is still budget oriented the Maxspect units may fit the bill or build a DIY array which will be the cheapest option but the most work. The commercial fixtures that are properly cooled and run the LEDs at full power are very pricey right now.
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