I have used them all.. Digilux, SuperRed, HortiLux and I use now $27 600w knock offs from some hydroponic store in NY that advertised on ebay, they work as expected no more or less yield then bulbs costing 4x the amount.
I document results eachtime I changed, and to me the result was the same, save your money buy a decent bulb and you will get the same results. Just like the rest of the MMJ hype, stoned growers praising or scolding advice... if the plants are healthy then it really doesn't matter or wont justify the ridiculous price point of the "hyped" bulbs.
I mean you see them all praising this, scolding that.. yet when they show their plants they look nothing like mine or someone in general who has been "learning and evolving" as a grower... sad. Kind of the same people who argue about flushing or not-flushing, defoliating etc... yadda yadda yadda