Radiums > LED
ATI Sunpower/Powermodule > LED
Actinic Pop = RB LED > MH OR T5....VHO close tie
Cost savings - LED > MH OR T5
It really depends on what you want - I've seen great looking tanks with Leds, but the best looking tanks I've seen (primarily in terms of sps color), don't run them....so until this starts occurring with any degree of consistency, I'll deal with the electric bill/heat/bulb changes...as I didn't enroll in the hobby to save money, but to obtain the best color and growth possible.