FWIW, I had a Gardenspot power supply die under warranty several years ago and Osram sent me an entire new set of lights - they couldn't/wouldn't just send a PSU. My advice is to also house the power supply in a case which protects it from weather. The power supplies they use are pretty junk (I've had 2-3 die) and the current one seems to have lasted longer since I put it in an enclosure to protect it.