my 600 w hps just burnt out i was wondering for the first 2 weeks of flower can i use the mh bulb till i get paid then switch to the hps again?
Metal halide is the blue spectrum and high pressure sodium is is the orange like the sun. i only asked about the mh because my hps burnt out. you can't flower with a mh...........i don't believe it would yield as much as a proper hps.
well the grow store would argue and many growers too read this link http://forum.grasscity.com/advanced...lly-what-best-light-spectrum-weed-plants.html
Well, as someone who has done both many times, I can tell you its bullshit. If someone tries to tell you that, find out why they think that, and if they say HPS has more red in it... ask them why that matters. It doesn't. The difference in red/blue from HPS/MH has no effect on the phytochromes that trigger flowering. Blue light has a shorter wave length and has more energy... -Loki
You will know the difference. It will be better. Light technology has evolved. There are MH lights made for flowering. And they kick ass. Word.