i meant to mention that. i have a 400 mh too and it doesn't even fit in the tube. a HPS is the only type of bulb that could fit. i believe the actual diameter is just under 4 inches
peace
-LFD
__________________ 2004 - White Rhino Soil to Hydro transPLANT... another 400W DWC from LFD 17.25 oz
2003 - Killer Queen, 1plant, 400W DWC - 1Lb yield It was fun.
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