45 watt Black Magic light?

you can regulate yourself with a foolproof method, :-) and that is to put your hand on the plant and see if it burns the light, if it burns your hand then it will also burn to the plant otherwise if it is bearable it will be bearable for you too, you can regulate yourself like this . I did so with my first plant (royal.gorilla.automatic). I had started with CFLs, and tried to keep them as close as possible, and with me this method worked. I hope it works with you too. good job.