maybe we need an open hardware LED bulb?
You're kidding, right? Do you have any idea how much "churn" there is in this area at the moment?
A week or so ago there was the "strategies in light" conference in Santa Clara. There must have been a dozen vendors showing off their latest "LED driver chips", "LED driver modules", "LED lighting ballasts", and etc. All touting different features still, along with efficiency, efficacy, power factor, etc, etc. And that doesn't include the vendors with complete bulb replacements. I rather like Seoul's direct AC driving chips (Acrich2):
http://www.seoulled.com/ - it looks like it would avoid a lot of the reliability issues of conventional DC supplies.
On top of that, the most frequent failure mechanism seems to be the LEDs themselves. :-( (for which there are additional proposed solutions beyond "we make good LEDs": exotic heatsink schemes, "remote phosphors", etc...
LED lamps are very much "under development", while "open hardware" pretty much demands a somewhat mature technology...