If I have to just toss it out to the dump after 5 years... that's not cool.
What you do with the unit at 5 years is really up to you. We will have better units available at that time, not necessarily because our design will change a whole lot, simply that LED's are becoming more and more efficient every day (like computer chips). Either way, even if you replaced the guts, you're still "dumping" a vast majority of it...
Maybe in the future we will offer swap out boards that you can screw in, and connect up to the two pre-existing power wires in your unit, but for now, that's not something we have in mind.
E-bay works great for recycling stuff like that!