Can anyone tell me what this label for a metal halide bulbe means? “MH400/BT37/U/4K”?
I would assume the MH400 means a 400W metal halide. But would BT37 be the brightness, and the 4K be the color temperature? What would the U stand for then?
MH400 is 400 watts
BT37 is the designation for the bulb shape
U indicates the bulb is a universal mount type….horizontal or vertical
4K is the color temp in degrees Kelvin
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