I would stay away from LEDS, unless you plan on dropping big bucks on a panel. The cheap ones are a waste of money, For supplemental lighting, u could use big CFLS, 150wtt cfls do wonders! My current 6500k cfl puts out 11,000 lumens. way more then a cheap led panel. The only issue is finding a high watt 2700k i've only been able to find 68w cfls in that light range. ~4200lums. But u could use two on each side instead of one. Its up to u, just giving some more options.
Going with a switchable ballast and light rail is def. a great idea. maybe if u can go with a 1k light, might not need the supplemental lighting with the extra wattage.