growth is about the same. But you only need 1/3 less watts with led. Supra a t8 can't penetrate past 2 inches. Induction can penetrate about 4 feet. T8 bulbs last about 3 months. Induction bulbs last 10 years. T8's have endcaps. Inductions don't. They use magnets to excite gases. T8's don't. how does a bulb block itself? Induction has a cri of 95. Imo cri trumps over par. I've seen first hand Inda gro kick the shit out of 2013 a51's with inda gro having less par and higher cri. It was 460w of ig vs 465w of a51. Oh and the only t8's with a decent spectrum are hagens. They run about $40 a bulb for 4 foot. Cree led t8's are cheaper.