Good option for old fixtures
Your review: I know this is a relatively new product and if it indeed lasts 50,000 hrs, I will be dead and can't speak to the life of the bulb.
Pros: Excellent replacement for the old metal halide bulbs. Love the instant on feature. No buzzing and waiting for it to warm. Very bright for the High Bay usage. At 165 watts, we look forward to buying more.
Cons: A bit pricey up front so we only purchased a few. This makes it hard to judge the power savings at this point as we have a 150,000 sf warehouse. This bulb still needs a working ballast.