For those of you with painted tanks..

[MrPillow]

Equipment Review: Getting the Most from Your T-5 Lights: A Look at Reflectors and More — Advanced Aquarist | Aquarist Magazine and Blog

An interesting read. Anyone ever notice any difference in coral/invert/algae growth that corresponds to the data presented?

Just curious

 

[HN1]

Very interesting. Thanks for posting it. I'd still paint a new tank though, I don't see any data for PAR values when the back and sides are covered in coraline.

 

[Ingy]

Coraline won't affect the critical angle of incidence. But it will affect the amount of light getting TO the glass.