I installed the 742P in the kitchen and 2-746P's in the dinette area. We use these area's a lot, the regular light tubes would start to dim after 3-4 months. The lights are full dimming to suite your liking, and provide the same light level at GE Daylight Tubes. While these replacements might be more expensive, it's a no-fuss installation, remove the old unit, splice the wires, reinstall the fixture. (Word of caution, check the wire colors, the colors are the opposite of the old tube fixtures)
I'm a happy camper.
I purchased the fixtures from John Drake:
19 A - Thin-Lite LED lighting .
Fred