I have 2 GLO fixtures. a 48 and a 24. the ballasts are built in . if you are viewing one with a external ballast it is a retro fit. to clear up another thing there is no upgradable reflector. its a reflector for the retro kit. still the one include is pretty good. the deep horse shoe shape works well. and i would agree with 4 inches in width.
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72 Gallon Bowfront Reef.. Hardware:2x250w Luminex Elite HQI Reflectors (Phoenix Hexarc Bulbs), Galaxy 2x250w Electronic ballast, Euroreef 130 Skimmer, Sedra KSP 7000 Retern... Live Stock: Pair of Hawaiian Flame Wrasse, Leopard Wrasse, Pink Streaked Wrasse, Pair True Percula Clowns, Potters Angel, African Flameback Angel, Orange Fin Tomini Tang, Yellow Assessor, Tailspot Blenny, Purple Firefish..
45 G FW Asain Barb Community tank.
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