Royal blue VS Actinic blue bulbs

[chandigz]

Originally Posted by shimmy

What is the difference between the Royal blue and the Actinic blue compact florescent bulbs?

I believe the difference between the two bulbs is a slightly different spectrum. Standard actinic peaks at 430nm while I believe that the royal blue peaks at 460 nm. I think the royal blue tends to be more blue looking. I don't know how it affects coral growth and colour though.