about the window sil no your fine and yes there looking right on track with mine. ive never compared it to anything else, its my first grow but its working wonders. im budding under them with a bunch of cfls added in, but a nice led is a good idea. Ive checked out led grows and i see tall sprindly plants but with very nice buds. the t5 will give you the bushyness you want so that it will stretch a little in bud id imagine. check out my grow and compare for yo self