Great bulbs. You do what you want. They light up when you flip the switch. They disappear when you turn them off. A bit of irony here, but it's hard to appreciate a lightbulb unless it's blown. :) We have two 10 inch clear glass bowls on either side of our patio. Place a green bulb on the right (starboard) and a red bulb on the left (port) to simulate running lights on boats and ships. (There's also a white light at the other end of our garage house - our stern light, which should be white, and it is.) I'm a sailor and a licensed captain, so it's pretty fun.
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