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[QUOTE="BadCon, post: 1184556, member: 17986"] In the US, just about every T8 fixture you'll find will use an electronic ballast. The cheap T12 fixtures still use magnetic ones, but Reptisuns haven't been available in that size for some time. There are varying qualities of electronic ballasts however, but the differences in operation are not as apparent as they would be if you were using a magnetic ballast as opposed to an electronic one. Magnetic ballasts flicker, and will typically hum and make noise. They also have difficulty starting at lower temperatures (though this isn't much of an issue for reptile enclosures). Your average electronic ballast will operate the light at 20KHz, while a magnetic one will operate at 60Hz. This is why you can often discern flickering with a standard magnetic ballast, which would often be impossible to detect under an electronic ballast. Electronic ballasts are also more efficient! Chances are, if you are using a T8 under cabinet light, its using an electronic ballast. I've never seen one that uses a magnetic ballast, especially if its designed for daisy chaining. A magnetic ballast would be easy to detect...it would hum, and you might notice some minor flickering. A magnetic ballast would also take awhile to start (a couple seconds), and it wouldn't be smooth. Electronic ballasts are usually instance on varieties (though there are different types for different purposes). [/QUOTE]
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