With much less energy than a real 100 watt incandescent lamp! However, be aware that some garage door openers interfere with LED lights - EMI/RFI or electrical noise/RFI. I stuck them in garage door openers and the remotes refused to work and the openers started showing error codes. Take them out and put in CFLs and the problems will go away. Still a great lightbulb - I'll use it elsewhere in the house!
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