Barrina 8 Packs T8 LED Bulbs 4 Foot G13 24W 6000K Cool Daylight, T8 T10 T12 4FT Fluorescent Light Bulbs, Dual-End Powered, Replacement for Fluorescent Tubes, Remove Ballast, Clear Cover, ETL Listed

I had been a parrot breeder for over 30 years and have used T12 fixtures to supply "daylight" to my breeders. Since the LED lighting has come out that cost much less to operate, we decided to convert our old T12 fixtures to use LED bulbs as the old florescent bulbs were becoming increasing dim and the ballasts in some of the fixtures were going. I have since retired from breeding parrots, but still have a couple pairs left that I want to supply the best lighting possible for them.After I bought the first set of 16 LED bulbs, we found that removing the ballasts from the old fixtures to use these LED bulbs was extremely easy. The difference in the brightness of the lighting was literally night and day. The 6000K provided by these bulbs is a daylight white and exactly what my parrots needed.Since the 16 bulbs of the first purchase covered only the area of the basement that my breeders were in, I decided it would be nice to have more lighting for the rest of the basement that we use. So, I decided to buy another set of these bulbs.The beauty of these bulbs is they cost about half the electricity to operate, and provide so much more lighting for so much longer. These bulbs also cost a lot less than others available. At this point, I would highly recommend these bulbs for anyone that needs to convert old t12 fixtures to LED lighting and needs the brightness of daylight lighting.UPDATE 03/04/19:We have had most of these bulbs installed for about 3 months. As yet, there has been no buzzing or flickering and the lights come on instantly. Since converting all of the T12 fixtures in my basement to use these bulbs, I am so happy that my basement is not only brighter than it's ever been with florescent bulbs, but my electric bill has gone down quite a bit. In a short time these bulbs will pay for themselves in the savings of electricity usage. The savings come in not only because of the lesser electrical usage of the bulbs, but eliminating the ballasts also save.I recently found out that the ballasts also use electricity in addition to what is used by the bulbs. So, your savings in electricity usage includes the lesser requirements of the LED bulbs and also the electricity used by the ballast. The life of these bulbs is also much longer than florescent bulbs.UPDATE 02/25/20:We have now bought 3 sets of these bulbs, and have had two sets of them installed for almost a year and a half. So far, not one bulb has failed. Considering the number of tubes we have lit for 12 hours per day, we have easily saved more than $50 per month on our electric bill. We couldn't be happier.UPDATE 02/15/21:We have been using these bulbs for two years. Some are on for 12 hours per day, and others for 16 hours per day. So far, not one bulb has failed or burned out. We have replaced all of the T12 florescent bulbs in our basement for these LED bulbs. We couldn't be happier with them.If my opinion of these bulbs changes, I will update my review. I hope this review was helpful for you.

Package of 8 allowed me to retrofit the exact number of fixtures in my garage. 6000 degree color temperature and 24 watts per tube means brilliant white illumination plus energy savings over previous 32 watt 'Ecolux' tubes. Aluminum strongback on tube also heatsink for LEDs thoughtful dual-purpose design, will hopefully last the rated 50K hours. Worth the wait. Installation easy for someone with minor electric installation experience - you'll need diagonal cutters (and maybe a few wire nuts depending on circumstances), wire strippers, and whatever tools you may need to access the ballast/internal wiring area of the fixture. Existing fixture wiring is readily relocated after cutting out the ballast. I left the ballasts in place in case I had to restore the status quo ante, but I didn't have that many good fluorescent tubes remaining. After the first one, install time went down to 15 min per unit. Will buy again (with better forward planning) - too many FL tube replacements on offer have dismal light output. Remember, you're trying to match or exceed the 3000 lumens +/- (Ecolux rating, find yours) of the former tubes, so shop carefully as cost should not be the only factor. So far, units work great with occupancy sensor/switch.

I do not recommend these bulbs they do not last. With the very little use I use them they've been going out little by little. Out of 20 bulbs 10 are dead and the rest are fading out. Made contact with the seller/ vendor and they never replaced after the communication.

These are very nice, perfectly sized for any 4ft bi-pin fluorescent fixture. Rewiring is easy, remove the ballast, and just make sure you connect the incoming black to the pins at one end and the white to the other. Very fast on, and brighter than the originals.Purchased through warehouse deals, I was expecting to get working product repacked, instead it appears many of the bulbs are internally damaged. The LED strip down the center was flopping loose, completely unattached at one or both ends on many of the bulbs. Packaging appeared adequate, I can only assume these were not checked thoroughly before repackaging.(Added info 8/23/17)After no contact from customer service, and no way I can find to get in touch with them after they said to contact them, I am lowering my rating to 1 star.(Added info 9/9/17)As you can see, the manufacturer followed up with contact details, and squared away the issue ASAP. They sent replacements for the damaged bulbs, and my rooms are BRIGHT now! I am very happy with the way they resolved the issue, since it was really Amazon's fault to begin with, not the product.