I have a wallbox with 4 S11 17mm bulbs with a 40w intermediate socket. One of those bulbs blew out and I ordered this set of 4 to replace them all. I was expecting LED bulbs to look different, so I planned to swap out all the bulbs so they look the same while saving energy. Although I replaced all the bulbs as planned, I installed one of these LED bulbs first. in the socket of a burned out lightbulb. When the lightbulbs were lit, they all looked pretty much the same! These bulbs look almost exactly like 40W incandescent bulbs. They had the same color temperature, same brightness, and the LED strips look so close to the filament you don't notice. They were remarkably similar. They were as close as possible. You can easily mix them with incandescent bulbs and they don't look weird or different. Yes, it is better to replace them all and get better energy efficiency. If you're careful about switching to them, they look the same. I don't know how long they will last, but in theory they should last a very long time.
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