I just sold my radion G4's, ran previously Hydras, kessils...all sucked compared to my Mh results.
I only do sps, so to me color and growth are KING, which made me go back to MH's, regardless of how shimmer, no heat...etc seemed real nice.
Leds these days CAN closely mimic Mh's, but are not there yet. I just bought a giesemann spectra SE with Radiums. Will stock up on bulbs for maybe three years worth, in case they somehow disappear before the three years come up. I will then check out what leds are up to and maybe take a plunge again trying leds.
MH's spoil me, because they make my sps grow to the max, and I end up thinking that is easily achievable with other fixtures. I then spend $ going led, and regret.
Led features are nice, led shimmer is awesome, but at the end corals are what makes me look at a tank.
Ive ran DE Phoenix in my previous tank, nice color temp, daylight with nice blue tint.
Radiums though IMO are what it is all about