Robertson 2P20132 Quik-Pak of 10 Fluorescent eBallasts for 2 F40T12 Linear Lamps, Preheat Rapid Start, 120Vac, 50-60Hz, Normal Ballast Factor, NPF, Model RSW234T12120 /A

Easy install. Works well. Reasonable cost.

The price was good and my electrician installed them .no more flickering lights

Wow! Amazing! Very powerful and bright lighting for 1/3 of the size ballast I used to have. As other reviewers, I was worried if it will work as its 1/3 the size of the ballast I have now, but it works great!!!!!!! 1/3 the size and 1/3 the price of home depot!!!!!!!!!

We purchased 20 of these and EVERY SINGLE one of them burned out within 60 days. Garbage.

perfect replacement the lights work like new again the price is great compared to products

I was quite skeptical because of the price. When they arrived, I was even more skeptical because they were a good bit smaller than the ones that we had been using. I was paying $27-$30 at local stores for these. I tend to replace them in the office as they go out. We have several rooms that we do not use in our office though so as they went, I let a few go bad prior to replacing them. I found these on line and felt like it was worth the try for the money. I could get 10 for the same price as I was paying for 3.I did have to drill new holes as the size of these would not permit me to utilize the same holes. This was a bit of a problem because I do not keep metal bits at the office. Regardless, I brought in a bit from the house and replaced 5 of your ballasts with these. They worked flawlessly. Great buy.

So far I've installed 6 out of the 12 ballasts that I ordered, and they all work very well. Instant on and produce brighter light than the 15 year old ballasts they are replacing. One minor unexpected side effect to consider: these ballasts are much lighter than the old ones, maybe one-third the weight. Because of that, part of some of the fixtures (each fixture takes 2 ballasts) in the suspended ceiling end up about a half inch above where they were before because the springs holding the fixtures don't have as much weight pulling on them. I guess I could put a brick on top of each fixture to correct this.

We are changing our old tube lights with the LED's. Makes all kind of sense.