Will these 4ft led bulbs fit in my T12 fixtures?
Yes, they have the same spacing between terminals so they fit in the socket on each side. But you do need to bypass/remove the ballast.
Is it dual-end powered or single-end powered?
Our tube light is dual-end powered, Not compatible with single-end powered sockets.
How to install the t8 led bulbs 4 foot?
You need to remove the ballast before installation, please refer to the wiring diagram above, hope it helps.
Which is the brighter, frosted, or clear lens?
The clear lens is brighter while the frosted produces softer and more diffused light. We have both types to meet your needs.