They are potentially dangerous. I've used them with 30w or 50w halogen bulbs and they melted the plastic case. I'm ashamed that I didn't read the reviews more carefully as other buyers reported the same problem. They may be good for low temp LEDs, but I would never want a device that couldn't handle halogens. I'm sending them back because nowhere in the description does it say they're only for low temp LEDs.
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