In a couple of days this DIY fixture will have 3 years under its belt! Despite it being a parallel set up & all the 10 watt LEDs purchased off shore, there have been no failures to date. I've made several of modifications since April 2012, but essentially it's been doing its thing trouble free (after I added several additional dimmers to handle the load). I think it's safe to say this rig now owes me nothing. No bulb changes for 3 years, I haven't done the math, but if I was still running my MH/T5HO combo, there definitely would have been a few $$$s spent renewing them.
I will likely remove the supplementary 5050 RGB lighting strips & replace them with more powerful warm spectrum 5630 strips. It's cool to play around with the RGB colours, but they tend to drift in spectrum & the 'white' light created when all 3 colours are on, is not really all that white. One strip appears greenish, the other more blue. They certainly haven't been as robust as the 10 watt multi chips & seem to keep changing spectrum on me. I have a couple of UV 10 watt LEDs that I considered adding, but the livestock I have at the moment seems fine with the lighting as is, so probably best to not mess with it & keep it simple.
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