My mistake. That could definitely change the range. I don't know if I would substitute rather than perhaps consider adding a CFl. LED's are definitely the future.
Many nice grows come from CFL's and you have the Kelvin range correct. To further what Nuggbunny96 said, I also noted the stretch. If you look through some CFL grow journals, you'll see the lights are usually less than 6" (commonly 4") from the canopy top. Always monitor plants after a range...
I've read about a few ppl using FK weekly. Personally, I water until runoff EVERY time in coco and have only used FK (or flush in general) during the veg stage if I notice an issue and want to quickly eliminate multiple factors. When outdoors or growing longer, I may perform a flush or two...
FloraKleen is designed to dissolve fertilizer salts. I've had great success with it indoors/ outdoors with Coco. I'm not sure what you mean by 'steady diet' but I use FK by itself and resume nutes the following day unless I'm final flushing.