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Low Heat Lighting.
LED will flower, although they will be smaller and a bit thinner than with HID. i've seen first hand what 450W over a 3'x3' tray will yield. it's good, but not great wheather it be in quality or quantity.
none of us (if anybody) has used induction lighting yet. i've read all about it but don't think it's gonna be any better than LED at present. but again, this is my OPINION and i haven't had the chance to play with any induction lighting let.
so the choice is yours, but nothing is gonna compare to HID. until we see reports with cannabis results using inductuion lighting, LED will be your best bet IMHO. it's still gonna take quite a bit of LEDs to get good results though. they still generate quite a bit of heat.
-shake