sun pulse says there 4k and 3k can but I do not know anyone using them I have some 3k on the way but i will only be flowering with them. www.sunpulselamps.com/Kelvin_guide.html but will have to get 600 watt from Amazon, eBay, or local grow store can prob get them they. Sent from my Clear using Grasscity Forum mobile app
Most growers use MH for veg and HPS for flower, but you can use HPS all the way through, you'll just lose the vigorous growth in veg (which means you'll probably want to veg longer). HPS spectrum bulbs are generally 2700K.
duel spectrum, if they make them in 600s. Otherwise, just grab a HPS and go for it. When you have more money, get a metal halide for veg.That's what every single person will tell you.