View Full Version : MH height with 10K bulbs

09/20/2017, 11:34 AM
sorry to ask but the search function is not working for me.

I have two 250W, 10,000K fixtures above a 24in deep 180gal display that I want to keep SPS. I continue to struggle with how high off the water level should I set the MH. any suggestions? I do not have access to a PAR meter....

thank you!

09/20/2017, 01:05 PM
It depends on what reflector is used. Generally speaking, use 8" to 12" as a guide. For 400w fixtures, 12" to 15".

Chris Mills
09/20/2017, 01:20 PM
I keep mine at about 8" above the water.

09/20/2017, 01:51 PM
thank you very much!!