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Sorry, you are wrong here. These are new tech CMH in a mogul based bulb. Yes, new. Not old school MH. They are not 'drastically' different. They are marginally different, by all of 2.4% better for the 315 CMH bulb over the 400w CMH bulb. If you do the math comparing the lumen output per watt...

You can get a new 400w MH mogul base bulb for all of $12 online now at 1000bulbs. Cheap as chips. If they last half as long, big woop. They are 7x cheaper than CMH. 400w HPS lights are about 40% brighter than MH, and 20% brighter than CMH. 50k lumens for HPS vs 36k lumens for MH, and 41k lumens...

Not in all cases, according to GE: GE 400 Watt CMH Bulb Data Sheet Specs: • For use with 400w magnetic HPS ballasts

There are several 400w CMH bulbs out there with a mogul base available that will run off of old stye MH and HPS ballasts. GE and Phillips have them. For MH ballasts: https://www.htgsupply.com/products/ge-400-watt-ceramic-light-bulb-cmh-lamp/ This is a conversion mogul base CMH bulb that will...