My Sunmaster MH bulb, although having been used now for only 2 grows (about 1500 hours) makes a hell of a lot of noise. This actually led me to cut short my veg time on my last grow which probably reduced my yield significantly.
So I'm thinking about replacing it.
Researching the major manufacturers ... they don't seem to agree on what is the optimum K rating for vegging.
Sunmaster MH bulbs are 4000 K
Solarmax are 7200 L
EYE Hortilux are 6500 K
Anybody got any recommendations ?