Small pic's man, kinda hard to see? maybe alittle burn. what have you givin them lately? It does not look like anything to worrie about. I get just alittle yellowing on tips after nutes but after a couple days looking good. Can't help you much on the mixture with CFL's and HPS system....But doing a CFL grow or even vegging, I would have them, surrounded!with CFL's.... HPS expert's will chime soon to support..