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"Actinic Light - Light emissions from actinic bulbs are predominantly from the blue end of the color spectrum. Produces photochemical reactions and simulate light conditions necessary for proper coral growth. These bulbs are ideal for reef aquariums and are best when used with a timer to recreate dawn and dusk lighting conditions. "
Out of the light spectrum blue is the main color that penetrates to the corals. I have VHO lighting and have two 160 watt super actinic and two 160 watt 50/50 bulbs. Here is a pic of them.
are those adapters you have plugged in to the bulbs i have 4-pin plgus as well and was wondering how i could get higher wattage bulbs for the hoood i have