Does anybody make these? I've been finding hps to MH bulbs but not mh to hps. I have a 1000 watt mh ballast. So would like to be able to use hps light for flowering.
they are around but alway been a little more expensive than the standard bulb, largely replaced these days by the digital ballasts that go both ways Mh and HPS, keep an eye on your power costs tho ?