I wanted to reduce the wattage of our overhead lights/fans: dual 18w fluorescent tubes in a 4ft x 4ft room are too bright. So I got those Bought 13W version. It turns out they have a key, so you can't do that: if it's made for an 18-watt bulb, you'll have to replace it with an 18-watt bulb. But it's not Sylvania's fault, it's my ignorance. I just want to warn you. Once I order the right power, it works great. Beautiful color and brightness.
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