4 Pack T5 21 Inch LED F13T5WW LED Replacement Bulb F13T5 LED 9 Watts 920 Lumens Warm White 3000k 120V F13 T5 13 Watt Bulb

I'm happy with these as a direct replacement for under counter florescent lights in my rental. There's only 2 things to note. The first is obvious, but I missed it. Make sure you get the proper temperature. The ones I'm reviewing are warm white. That is sort of a yellowish white. I now know I meant to get warm white. That's my mistake and I'm living with it as I do not expect the seller or manufacturer to fix it especially after I took them out of the box before understanding this. The 2nd thing is there actually is a front/back to these since they are LED. There's a black strip across one edge that I'm assuming is the back of the LED strip inside the tube. This is fine as my fixtures point down. I just adjusted to make sure the black line was on the back side of the fixture. They definitely are a lot brighter and I think they'll last a lot longer than the fluorescent bulbs they replaced.

I received a box of 4 of these LED replacement of Fluorescent lights. The amazon box was damaged, but the LED bulbs survived and were ok. The fixture has both a 12 inch and 21 inch bulb to provide a wide light. I kept the Fluorescent 12 inch but replace the bad 21 inch Fluorescent with the LED replacements, and THEY WORKED together! I had previously bad experiences with Fluorescent replaced by LED, but this one worked fine for me. The 3000K color appears to match the existing 12 inch Fluorescent, which is good too.

I rarely write reviews, but felt compelled to this time. The light is warm as advertised, they immediately come on, and make no noise. So much better than the old CFLs. I almost bought the types of bulbs where you bypass the ballast, to get rid of the humming. To my surprise, there is almost no humming with these bulbs. Was is the CFLs themselves humming? Either way, a pleasant surprise. We will see how long they last, but I'm never going back to CFLs. As others pointed out, these were longer than the Siemens branded bulbs I removed. It wasn't a problem for my light fixtures, but you may need to grind down the terminals if they are too long for you.

Purchased the Bluex 3000K bulbs mainly as I needed both 12" and 21" lengths for a kitchen retrofit. Some reservations on quality but all 12 bulbs tested OK upon receipt. The two issues I have are the pin spacing is just a bit too wide to fit my 20 y.o. ballast tombstone connector slots. Required using pliers to reduce the pin tip width about 1mm. Easily done with deft hand. Also a single connector twisted trying to rotate one bulb in place. Required me to manually rotate the bulb connector back to alignment. The bulb worked OK after rotation and verifying no movement when re-installing. All bulbs still working OK after 6 months of use and look great in my remodeled kitchen. Go slow on installation to save headaches. These Bluex T5 LED tubes are “Type A” only just like the old fluorescent lights. Some useful info when shopping T5 LEDs: Type A - Ballast required, Type B - Line Voltage only, Type C - Other voltages like 12Vdc. I’ve seen dual Type A/B LEDs. And Type Bs can have different wiring at pins. Gets confusing and no industry standard.

EXACT color and brightness of the other working fluorescent bulb. Nice warm color. But this bulb lights instantly - the other bulb comes on several seconds later. I was tempted to replace the working fluorescent bulb, but I'll wait until it burns out... I would not hesitate to buy these again.

These turn on instantly and are better quality than one of the main CFL brands that I was using before and half the price. Seller support is also very good per the reviews, so you have nothing to lose.

Would give zero (0) stars if possible. Item is Bluex LED Tube, F13T5 9 watt 3,000K, ballast compatible. Made in China, of course. Placed first order Jan 25. First order of 4 bulbs, which took THREE MONTHS to ship, arrived on 25 March with two bulbs shattered and unusable. Asked for a return/replacement, which Amazon shipped promptly. Replacements arrived 1 April, 2025, intact. Two of the four bulbs would not function at all in any fixture. Fortunately, I had two useable bulbs from the first shipment, so elected to just put the new bulbs in and call it a wash. One of the new bulbs from the March 2025 shipment began to flicker, and quit working today (14 Aug) only 5 months later. So, out of 8 bulbs ordered, five of them were unusable for various reasons. I can't ask for a refund, because "the window is closed..." This is utter consumer abuse, and the Bluex company is guilty of it. No quality control, no dependabability, no pride. Shame on Bluex.

Purchased these to replace the dreaded short-lasting fluorescent tubes. Install was easy and fast since they are a direct replacement. Fitment is fine. Took 1 minute to replace three bulbs.