Tom's Hardware just put the finishing touched on their review of the Thermaltake Smart Pro RGB 850W power supply. If you want a quality PSU with RGB lighting that doesn't break the bank, this could be the PSU for you.
The reason behind Thermaltake's entry-level efficiency rating is lower production costs, allowing the company to achieve competitive pricing. Of course, RGB fans are more expensive than non-lighted ones, but TT apparently thought it'd be nice for value-oriented enthusiasts to have flashy-looking PCs, too. We tend to think that every penny should be spent on improving performance, especially efficiency, rather than wasting money on handsome looks. But most marketing departments disagree.