leds for a 40"x20"x24"H SPS tank

[ahmedess]

I have a 40"x20"x24"H SPS tank. currently running a single 250w radium which is not enough and i was thinking of buying another 250w radium besides the one i have. Also I m thinking instead of the MHs i would get the 48 Ultra Premium LED DIY Kit with Dimmable Drivers, do you think this is good enough to grow SPS on a tank that size? Also which heat sinks should i use with this kit? I m thinking may be two of the 4.25x16 or two of the 5.9x9.

[Rapid LED]

A 48 LED kit is plenty of light for that sized tank, even for SPS. How high above the water will the lights be? If it's close to the water then you'll want 16" heatsinks, but if it's going to be 9-12"+ then I think you could probably get away with two of the 5.9" x 9" heatsinks.

[ahmedess]

I m planning on placing the leds inside my canopy. The maximum height from the surface of water to the top of the canopy is 12" so I can raise or lower the lights in the range you have given without limitations. Could you please explain how the height affect the choice of heat sinks to help me decide the height to fix my lights at? and which type of lenses should i get? I was thinking the 60 degrees.

[Rapid LED]

Light from your fixture is going to come down at an angle, depending on the lenses you're using. Thus, the higher up your lights are the wider the light will be spread across the tank (that's why I mentioned if your lights are higher up then you would be able to get away with a small heatsink). 60's sound right for your tank height and distance from lights to the water.

[ahmedess]

A 48 LED kit is plenty of light for that sized tank, even for SPS.

If the 48 xp leds run at 100% would they match a 400w MH, knowing that only 24 of them are Xp-g cool white and the rest are Xp-e royal blue?

[Rapid LED]

Typically 24 LEDs is about a 250W MH, so 36 LEDs should be the same or better PAR than a 400W MH.