For regular 120vac spin in bulb sockets I found the philips LED's at home depot to do well with dimmers and so far not one has failed in over a year. Can't say the same for the 9 watt bulbs I got from dealextreme a while before that. Most of those are dead. So much for thousands of hours bulb life. You get what you pay for. I have lots of LED strip lighting in my living/dining room above beams. They aren't bad but not crazy bright. Can choose a myriad of rgb colours. Try to find twin packs of the philips led bulbs, best $ savings.
The cheap LED bulbs either have inadequate LED driver circuitry (that fries) or they over-drive lesser watt LED's and the LED's fry.
Surprisingly, HID still offers more efficiency per watt. If you already have a 12v battery bank. Try any number of cheapo HID kits available on ebay. Can be found for under $35 for two ballasts and two bulbs. Get the 4000-5000k colour bulbs. 35w HID is VERY bright. With my K1200LT BMW I can now actually see stuff at night! Anyhow, experiment with sticking an HID bulb into a big glass globe type fixture, I'm sure 3000 lumens will be plenty bright. Take a look at LED vs HID further down this page: http://www.hid-lightsdownunder.com/... 35w HID takes 39w of LED to equal.