Well after seeing the color of corals pop under leds over the last year or so and continuing to see my electric bill so high I am switching! I have picked up 2-24X 8.75 heat sinks and I am buying the 36 led dimmable set on rapidled.com. I am planning on updating with how difficult it is to install the leds and the impact on my corals in comparison to the 175 watt mh they are currently under. I have a 75 gallon tank so I should get great coverage with the bigger heat sinks. I plan on adding 36 more leds and maybe another smaller heat sink and using it on my 180 (currently freshwater) when I graduate college. If anyone has any pointers, I am all ears.