only 2 kinds of lights led and hps, theres crossover between the 2 middle led panels and the single hps right now but the 2 led's on the end and the 2 hps on the other end have no crossover, when the lights get here I will mount them like this, 2 TopLed panels then 2 area 51 panels then 2 more area 51 panels then 2 1000w hps, the lights will be mounted at the right distance apart so that there should be very little crossover. Led's with lenses have focused beams of light, you can see the the shadow on your hand when you move it outside the core footprint so as long as they are spaced correctly there should be very little crossover, because they wont start to cross over until below the canopy outside of the core footprint.