So im new to mh bulbs and wanting to know where are some of the best places to buy them from and what brands people would suggest I know that most people prefer Radium 20k so if there is any others that you would suggest that would be helpful also Im wanting to know whith a Radium 20k or similar bulb is it suggested to have supplemental lighting ive read it both ways so wanted to see opinions. Also if someone is going to offer me to buy used bulbs i wish i could right now but already have two bulbs but want to plan ahead and in the next few months when i can afford it have some backups. OK thanks