Flowtron Replacement Bulb

My Flowtron Bug Killer has a built-in light sensor so it will only turn on at night. This bulb was only used for ~9hrs a day during the 1.5months I used it. I bought this bulb in April of 2019 and I had it in storage until mid-May of 2021; when I started using it in my Bug killer. About 2-weeks ago (July 1, 2021) the bulb started flashing on and off. It never really went DEAD, but, flashed on/off with different parts of it never coming back on while others did go on/off... The bulb only lasted about 1.5months... I would have called Flowtron about it, but, I bought it 2 years ago and didn't use it until this year. It pays buy stuff and use it during the warranty period.... This is unusual- in the 40+ years I (and my family) have been using Flowtron (and other) bug killers I've never seen a bulb only last less than 1 or 2 seasons! Obviously this bulb was defective. I have since bought another bulb (from another vendor- this one (Amazon?) is out of stock) and it's working fine so far.