It's intended to be bolted into a cast aluminum fixture, that has heat sink fins, I think. I've only run it for a few seconds at a time.
I use the 1.5 watt units outdoors for stairway and garage door lighting, and they're good enough for that. They work fine at 0 degrees F, where CFs won't start. The power is so low I leave them on all the time... a timer would waste more energy. The ones I recently bought have 32 white TO 1-3/4 LEDs poking up out of the base. The energy payback time is something silly, like two months.
They don't work with a conventional dimmer.
John