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It is a standard 55....I can order a 4 bulb lot on eBay for $39.99. Thinking about getting the 2 actinic (spares) and 2 50/50. Not sure how long the life is of these bulbs so nice to have back ups.
It has two cords and I have them on separate timers. The light has only two rows. The lights are the four pin dual bulb 21". Kind of sets up like this:
===== ===== (back are blue)
===== ===== (front 10k or 50/50)
I have a 48" Coralife 4 bulb (4x21") light, back row is 2 Actinic bulbs and was wondering if I should go with the front row 10000k or go with 50/50 combo. I like a little bluer look to bring out the coral colors but will that be enough 10k light for coral growth?