I would replace HPS/MH with CMH. CMH saves energy, generates less heat, improve quality and longer bulb life. Many of our customers cut their energy bill by half.
I prefer to use 2 315s rather than 1 630DE to get more even light spread. Also Philips 315 T12/942 bulb has better quality than any DE630 bulb.
Please see the spectrum here: https://www.sunplix.com/product/philips-315w-cdmcmh-t12-bulbs/
3 315s can give you more even light spread than 1 630DE and 1 315.
https://www.sunplix.com/product/315w-cmh-grow-light-fixture/
https://www.sunplix.com/product/400w-knob-dimming-low-frequency-cmh-grow-light-fixture/
You should switch from HPS to CMH, full spectrum, less power bill, less heat, better quality, higher THD, etc.
All these are grown under CMH: https://www.instagram.com/sunplix_cmh/
A Facebook group discussing CMH: https://www.facebook.com/groups/248519675519386/
All kinds of CMH fixtures...
Two types of 630W CMH:
https://www.sunplix.com/product/sunplix-630w-double-ended-cmh-grow-light-fixture/
https://www.sunplix.com/product/sunplix-700w-dual-350w-ir-dimming-grow-light-fixture/
Philips MasterColor T12/930 and T12/942 bulbs are tested with SunPlix 400W knob dimming low frequency square wave ballast. Here is the SPD: https://www.facebook.com/SunPlix/photos/a.1234719539879074.1073741828.1230894316928263/2055876931096660/?type=3&theater
If anyone outside USA wants to buy our CMH grow light, please email to [email protected] and advise which light and how many you need, as well as the postal code, we will reply you with a quote. You will love our light as other customers did.