No matter which type of bulb you use you should also use your camera's color and EV adjustments to fine tune the results.
I use the same LED lights that Brandon uses. I switched from daylight color temperature bulbs 2 years ago. I love how they are cool to the touch and small enough to maneuver in tight spaces. As long as the white balance is set correctly you're good to go. It may take some practice in order to get used to them however.
I also use the Jansjo LED's. The color temp is cool, so you need to make sure you WB is correct. I do a test with an NGC slab and make sure the white of the insert matches the photo. Here is a shot with the LED's.
Only in America. You can commute back and forth to work in a Hummer, you can set your home thermostat to 65 degrees in the summertime--or 75 in the winter, but you can't use an incandescent light bulb because it uses too much energy.
The only way to get people to do certain things is to force them to do it. It's easy enough to remove incandescent bulbs from production / shelves -- it's not so easy to invade people's homes and tell them what to set their thermostat on. Those same people driving the Hummers are the ones complaining about gas prices. You can't save people from their own stupidity...
What about grading lights? In theory, I'd love to use an LED because of the energy efficiency aspects, but I've only ever graded coins under incandescent light.
Not quite so. The only bulbs banned (so far) are general service bulbs in 40, 60, 75 and 100 watt sizes with the regular lamp style screw in bases. You can still get three-way bulbs, bug lights, heavy duty bulbs in the regular base. Also a myriad of various bulbs with plug in bases like flashlight bulbs and automobile headlights. You can also still get incandescent vanity lights, candelabra bulbs Christmas lights and other small base bulbs. As far as the bigger bulbs some manufacturers have gotten around the ban by making 43 and 72 watt bulbs. In future years the ban may be expanded but there's no problem now.