im actually using a plusrite,next to a htgsupply "agromax" 400w hps,with supposedly 30% blue light,so a cheap standard bulb,next to an expensive growlight bulb.
i can visibly and noticeably see that the agromax bulb is brighter than the cheap bulb,significantly brighter,with a whiter and more natural light,than the dull-red orange of the cheap bulb.
also the agromax bulb starts off a crisp,white light,then gradually turns into the hps spectrum,
the cheap bulb starts off orange red and ends up the same spectrum,so from what i can see,the expensive horticulture bulb outperforms the cheap,standard hps bulb.im really excited to try the lumatek enhanced par bulbs.