F13T5D – T5 21 Inch Under Counter Fluorescent Bulbs Bright White Daylight 6500K 13-Watt F13T5/D 21” D Long Life Replacement Tubes for Under Cabinet Lights – Pack of 6 Bulbs

Great product.

All of them worked in my fixtures. Note that the 21 inch measurement includes the metal connection pins at the end of the tube.

Totally embarrassed!! I wrote a negative review a little while ago for this product for non delivery. However, a neighbour picked it up, I had asked her but she had said no, then discovered it in her trunk !!!

It's a fair price. The bulbs are very bright. They are packaged well and each bulb has its own protective cardboard sleeve. I installed three shortly after they arrived. One lasted about two weeks! Yes, it died after two weeks and it wasn't used that much! After inspecting the bulb, it had dark black internally on one end of the bulb. Maybe I got a defective one because the other bulbs that I installed are still going and are used more frequently than the one bulb that died after two week.

Replacement for original tubes, over kitchen cabinets. Fit well, and brightens up the room.

Great product. Fast service.

Loved the "Daylight" fluorescent undercounter bulbs. And they arrived safely.

Update: I purchased these bulbs, due to the price and description, as replacements for over-the-counter lighting in my kitchen. I had previously purchased a different manufacturer's 2-pack on Amazon and had enjoyed more than 3 years of service from those two bulbs. I received this 6-pack of bulbs on November 5th, 2019. I found that these bulbs were not very reliable, as they failed after a very short time. I reported the failures in this forum as I progressed through the box. Today (February 16, 2020) the 6th and final bulb in the pack failed. Basic math reveals that each bulb lasted, on average, 17 days. The picture shows one of the failed bulbs at the bottom, with a fresh bulb (which later failed) above. You can see the blackened end of the failed tube. This is a completely unsatisfactory service life for a bulb under ANY circumstance, much less a 2 to 3 times per day activation of the ballast (each day) lighting my kitchen counter.The light from the bulb is fine and the brightness appropriate. Unfortunately, replacing a typical "residential use" of this bulb less than every three weeks makes this an expensive proposition, regardless of the favorable per unit price associated with the purchase. Because of the extremely poor service life, I cannot recommend this bulb under any circumstance.