I don't know if this is relavent but it is my observations on my tanks
230g - calcium reactor - 3X400W MH Geisemann megachrome bulbs (13K) 2X PC actinic and 2X 10000K daylight - coralline OK but was better when using coralvue 15K (I think) bulbs (glass tank)
190g - calcium reactor - 3X400W MH Geisemann X 2 and Reeflux X1 - 2 Actinic T5 and 4 10000K daylight T5 - good growth on rocks but not much on back wall or equipment (acrylic tank)
44g cube - no calcium reactor - 1 X 250W Geisemann megachrome bulb - no supplimental lighting - excellent coralline growth on all rocks and sides of aquarium and internal equipment (glass tank)
24G JBJ Nano - no calcium reactor and no supplimenting calcium (weekly 30% water changes with Tropic Marin salt) 1 X 175W MH (can't even remember the K) and 2 X VHO actinic - amazing coralline growth everywhere.
So from my observation it would appear that the VHO bulbs seem to spark the most growth and colour.
Just my 2 pennies.
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