2D 28 watt fluorescent light bulbs with 3500K light color are different from circular bulbs in that they have a more rectangular shape. If you have a light fixture that has these, you won't be able to use any other kind of light bulb in it's place. It's a really unique light bulb and comes in several wattage although the wattage are not interchangeable. The color is a neutral white color temperature appearance so it works well in homes and in multi-housing unit's to give a comfortable inviting appearance. The color is made to be very much like incandescent color and there are no choices other than that. The base does have a 4 pin configuration and that has a special kind of socket that it plugs into.

- 28 watts.

- 2050 lumens.

- 3500K.

- 10,000 hour life.
- A kind of square shape.
- 4 pin socket connection.