Bit late but I have a very similar bulb made by Hortivision 600 CMH works great with 2 240watt kingbrite v3 in a 4ft-4ft tent only had to lift the hps 2inch to match the lst of the 400 HPS
Thanks so much for my problem fix I have been renting a house from the 70s had me fucked what was going on after lots of dollars spent that was my only fix looking in my walls the earth is just a bear copper wire thanks mate from Australia
Hi I had same problem with 2-240watt kingbrite and 400 HP's on same circuit leds glow HPS nothing on pin timer went to a dule pole timer as the .8 of a watt measured with a voltmeter from - to + was enough to make that glow funny not many people check how the dark cycle is going