LED Can Lights

They make adapters to have LeD lights in a can

They just screw in like a bulb. Have you heard of Google? They have tons of info

What others have said. You can usually grab them on sale at Home Depot. You take out the halogen surround, and the new led blue screws into the socket and pops into the can.

If your ceilings are low, it helps with the heat tremendously.

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Br30/br40? Just replaced 18 cfls can lights in my house with leds 2 weeks ago. About $7 each from home depot.

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Much cheaper than I thought it would be. How does the light compare?

I'm actually going through this right now.

Not only did we want to want to replace them for better energy efficiency but to also try and seal some the airflow through the cans. The hot light combined with the numerous holes/perforations in the can create a "chimney" effect causing conditioned air to escape into the attic (single story house). This bad in the summer and terrible in winter ( the hot air rising).
Green building advisors HATE can lights for this reason.

So to seal off the airflow through the cans we are using an LED Recessed Trim Retrofit. Several companies make them. They are mostly air-tight and sit snug to the ceiling combined with a gasket I think they will fit the bill. We ordered three different lights and have settled on these from Amazon They felt much better made than the others and of course they were the most expensive. With 28 can lights we wanted to make sure we liked them before spending $500.

Most of these led lights claim something like 30year lifetime but I'd be happy if they make it 10.

Something else to pay attention to is color spectrum. When an Led light says its 5000k that means it will be closest to sunlight. Some people say that this is too "harsh" for inside. 2700k is the color of your average incandescent blulb which is a "yellower" light than say 5000k. The linked led is 3000k which is a step above incandescent and we liked that the most.

I should mention that this post applies to 6" can lights. But probably would apply to 4" lights as well--just won't be able to use the linked light.

Make sure to buy an LED/CFL compatible dimmer or you might get a strobing effect

What lucky-so-n-so said. I have those and they woRk great and dim very well and look pretty close to an incandescent bulb. I use the leutron maestro switch. So, basically, you get 2 for $25 and they should last a really long time.

I have 10 cases of br30's I grabbed off Amazon last year. So far, I've only need 2 bulbs. I'm sure I'll move to newer, more efficient solutions at some point. As they become more common, the prices should be better.