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I had six T8 4 bulb fixtures in the garage. Some of the bulbs and one ballast were failing. Time to update! These were a great way to do it. Installation was simple. Remove the ballast connect the common (white) wire to one side of the bulb, and the hot (black) wire to the other. I found that the 8' 4 bulb fixtures I have were wired so that the outer end contacts were one connection and the inner contacts the other. So, the yellow fixture wires connect to the white wire. The red AND blue wires all connect to the black wire. Viola! They are BRIGHT! They are of the daylight spectrum. They are not soft white. This is what I was looking for. There is nothing worse than trying to make that repair, or complete that project in dim lighting.