Easy to install, no modifications to the lamp needed, no messing around with old ballast. Plugs into the existing 4 prong plug that the old bulb did. Female connector housing is a bit larger than the mating recess around the male connector on the bulb...  Read More

Both bulbs start making a clicking noise and then turn off. The connector seems to be located differently.

This product advertises as compatible with a standard ballast. New ballasts cost more than the lamp and are difficult to install. This should not be marketed as a drop-in replacement for fluorescent circular lamps.

These bulbs are very bright and have a warm glow even at full power. They all dim well and without any buzzing. Haven't installed dimmer, yet.

Only downside is they are made in china. They exceed their cri rating of 80 at a measured 84. They are 75w equivalent at 940 lumens, which for a br shape at this power consumption is adequate.