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I needed 6 of these 12" fluorescent bulbs for some fixtures that are very old (about 20 years) but get used very little. Bulb prices vary from $2 a bulb for the el cheapo ones to $9 a bulb for the premium Philips or GE bulbs. So I decided on these $4 middle of the road bulbs. I install two bulbs in a fixture that had two failing lights (lights up but restarts after a few seconds) and these new bulbs won't stay lit, they restart over & over again, even worse than the old bulbs. So I remove the new bulbs and install two brand new T5 starters and put the new bulbs back in. Same thing, bulbs won't stay lit, they restart over & over again. No improvement whatsoever.
So I go over to a different fixture that is working fine, the old lights fire right up and stay lit continuously. I remove the old bulbs and put two new ones in. Guess what, the new bulbs won't stay lit, they restart over & over again. I put the old bulbs back in, everything is fine. These bulbs are NO GOOD.
One bulb lasted 6 months (520 hours) and the other lasted 18 months (1,560 hours). These bulbs are in a light fixture that gets used about 20 hours per week or 1,040 hours per year. So...the claimed life of 20,000 hours is total nonsense. Do Not Buy! Spend your money on LED replacements.
When I got both of them, I put them in correctly (and double checked, even, thinking I was crazy) and then when I checked the bulbs themselves...... they were both broken. Threw them away before I thought to return them, but at least they were cheap!
By the time I needed the bulbs, I took one out and put it in and it worked for about 15 seconds, then burned out. The second bulb was 1/8" too long to fit in the light fixture!!! When I compared the length of the 2 bulbs in the box, sure enough one was longer than the other!!! These bulbs stink, don't waste you money!!
I bought these in August 17, 2019 and the first one used lasted until April 1, 2020. Only about 5,000 for one used as a garage light. The second one lasted from April 1 to Nov 3. which is about 5,400 hours - not the 20,000 hr as advertised.