A black silhouette of a light bulb mostly based on openclipart.org/detail/155965/light-bulb-minimal-design. I also used openclipart.org/detail/104485/ampoule-light-bulb for the inner part. The background is completely transparent.
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Light bulb silhouette free icon was designed by rugkme for icons Png and presented to its users.
rugkme
1/19/2018