We redesigned the kitchen 5 years ago and replaced the traditional 'glasses' with these LED versions. They are easy to install and come with a pigtail that screws into an old lamp socket. Unfortunately, I had to replace two of the four units originally installed by the electrician. For now we're going to stick with them unless I want to replace all four with something else. When the light works it is very bright and doesn't give off the heat of the old incandescent bulbs. When ours failed, they began to flicker at different rates. It's worth considering other options for durability, as LEDs are designed to last much longer than incandescent bulbs.
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