We manufactured the lamp with the intent that it will last forever. I know that's a bold statement, but I mean it. LEDs don't have a simple lifespan estimate (it depends on application), and you've got 4 of them in there to last you quite a while.
For the geeky, it helps that we're not using PWM on the lights.
Try not to break it, but just in case, we'll be making a lot more ; )