Go with the LED's because they are much more simple. I have not used HPS, but I have used CFL and LED. LED's are more expensive, but well worth the money because they last a long, long time and are easy to manage temperature wise. You need to be focusing on how to balance ph, nutes, and all the other stuff we have to learn to grow successfully. When you get all that right, then give HPS a shot because you will need to focus on safety when having that kind of heat and electricity.