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View Full Version : lighting ques- nipples up or down


seaduck
12/02/2010, 07:57 PM
150w hqi de bulbs have nipples on both interior and exterior surfaces of the 2 bulbs both on the same side of the bulb. Are u supposed to install the bulb with nipples facing up toward the fixture or down facing the water? I currently have them facing up toward the fuxture so the side facing the water has no nipples to obstruct the flow of light....????