I was quite skeptical because of the price. When they arrived I was even more skeptical because they were a lot smaller than the ones we were using. I've paid $27-$30 for them at local stores. I usually replace them at the office when they leave. We have a few rooms in our office that we don't use, so I let a few lapse when they left before replacing them. I found them online and for the money felt worth a try. I was able to get 10 for the same price as 3. I had to drill new holes as their size didn't allow me to use the same holes. This was a bit of a problem because I don't keep metal parts in the office. However I brought some from home and replaced 5 of your ballasts with these. They worked perfectly. Excellent purchase.
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