20 Pack 3CCT 4FT LED T8 Hybrid Type A+B Light Tubes - 18W, 4000K/5000K/6500K Selectable - Plug & Play or Ballast Bypass - Single/Double End Powered - 2300lm Frosted Cover - T8 T10 T12 Compatible - 120-277V UL FCC Certified - Perfect for Offices, Warehouses & Retail Lighting

I purchased this item a few days ago to replace 16 dying regular T8 fluorescent bulbs in my garage (four fixtures of four lights each). I read the reviews and was apprehensive about the quality of these lights and shipping. There's a number of reviews complaining about broken lights, delays in turning on and flickering.Let me address those separately.The light bulbs:These bulbs are "plug-and-play" replacements for T8 lights. You can plug then directly on a fixture with an electronic ballast (most ballasts today are electronic) or open the fixture and rewire it, taking the ballast out of the circuit (making them slightly more energy efficient.) They're also inexpensive and the "glass" is frosted, which I find less harsh on the eyes.When it comes to brightness, they're not the brightest bulbs I've seen, but bright enough. I have another fixture with two 2ft LED bulbs that will burn purple bars in your eyes if you try to look at them. This is not the case here. They're as strong as a new T8 bulb of the same size.The color temperature is about 5000k. This is not the "supernova white" of 6000k or the "catacomb yellow" of the 2800-3000k. For indoor use, I prefer 4000k. 5000k is an excellent choice for garages and the kitchen where good color rendition could be useful.Shipping problems:Many people complain about shipping problems and broken lights on the review section for this product. In my case, the 20 bulbs came nicely packaged with foam protecting them all over. No broken bulbs. Shipping was also pretty fast.Flickering issues:So far, I have not observed any flickering issues. LED lights with poor voltage regulators (like the cheap ones you can buy at dollar stores) tend to do that. These (so far) shine steadily, with no problems.Long startup times:Here comes an interesting observation: Some people complained that the bulbs can take up to 0.5s to turn on. I direct wired one of my fixtures (removed the ballast) and left three of them with the ballast (see below why). The direct wired one shows the slight "delay" to turn on, while the one with the ballasts don't. This is interesting. I expected the opposite.Why didn't you direct wire everything?Direct wiring the fixture has the advantage of taking the ballast out of the way (and they do go bad), with the side advantage of making the fixture lighter in general. The operation itself is very simple but I had a ton of pain performing it on one of my fixtures. Some fixture manufacturers use some kind of wire that is basically *impossible* to strip properly. I tried three wire strippers and none of them would work. I ended up wasting a *lot* of time on this. Note that I'm very used to electrical work and never had a similar problem with regular wiring, but this is the second brand of fixture I observe the use of this type of wire. For that reason, I decided to leave the others with the ballast and deal with rewiring them if/when the ballast dies.Conclusion:So far, everything looks very good. I'll keep my fingers crossed and update this review as time goes.