Friend of mine is planning on ordering from RapidLED as well.
The systems come with Cree bulbs which are supposed to be the best.
According to my research the XP-G Cree is the best.
Then you decide on your lens 40 degree 60 degree 80 degree and 100 degree.
Lower the degree the more concentrated the light the smaller the spread.
I personally have just ordered a light fixture from China that runs on Cree XPE bulbs at 3 watts. Most systems are brought down to 1 watt to extend their useful life.
I believe most good systems run on these Cree bulbs.
One thing to remember from what I have read on LED is that the watts per gallon rule does not apply. To the human eye the LEDs might not look as bright as the metal halide but some people have reported their corals have bleached due to too much light from the LEDs even though it looked like it was dimmer than the MH.
It is still pretty underused in the hobby so finding info is difficult.
I started a thread on a 10 gallon nano that I will be running these cree bulbs on to inform people of my findings. My setup is 10 (12k) Cree white bulbs and 2 453 nm blue. All are 3 watt
We will see what happens.
Hope that might be some useful info for you.
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