Zoo Med 2 Pack of T5 HO ReptiSun 10.0 UVB Daylight Lamps

First bulb of the two-pack worked great, no concern. Six months later, I went to replace it with the second one from the pack and it won’t fit! See the pic I posted, the new one on the right is just a little longer, enough to not fit into the ballast. Of course, since it has been almost a year, I can’t return it. I don’t even understand how that even happens. Aren’t they manufactured based on specs…

I was skeptical to order in fear of breakage during shipping but local pet store has been out. I could see my last bulb was not producing adequate uvb and needed replaced asap. Amazon did ship in a larger box with product wrapped in bubble wrap no additional filler to keep from bouncing around in box not labled fragile. On all shipped bulbs delivery seems to be the biggest issue. I did end up having issues and amazon was not very helpful. But I am still giving 5 stars because reptisun is still a better uvb than most on here and the seller was kind understanding quick to respond and helped resolve the issue.. They weren't visually broken but 1 did not work the other worked only briefly. And it almost looked like it had been a returned item they shipped as logo looked a little worn off but maybe just a bad stamp. Bulbs are fragile maybe it was just a dud it happens. Amazon should do better with packaging fragile products and their customer service needs better training and solutions for stuff that's fragile especially for items so important for pet health. Kudos to One Way for Exceptional service. Not going to ding the review for something out of their control

Work well. They say to replace them every 6 months but these have been good for well Over a year now

T5 bulbs are supposed to last between 6 months to a year. Mine hardly lasted 2 months before it burned out and short of removing my one functional bulb (which I can’t do because my reptile needs it) and shipping both back at my expense for a refund, Amazon wouldn’t do anything about it

I have been using these bulbs for 5 years now for my bearded dragon. This month, I ordered replacements and I noticed they were giving off a slightly purple color instead of the normal bright white color. I reached out to ZooMed customer service to find out if this was a fake or if they made changes and this was the response I received: "Thank you for reaching out! I apologize for the confusion, but rest assured there is nothing wrong with these bulbs. You actually have the newest version with an improved UV spectrum. Here's more detailed information about the improvement and why it looks different: The main purpose of our ReptiSun T5 line is to provide your animals with beneficial (but invisible) UV wavelengths that are critical to your pet’s health. We continually work to refine the UV spectrum to better match the best light source out there – the Sun! In the latest update, they increased the (invisible) UVA2 output so that the overall UV balance (UVB to UVA) more closely aligns with natural sunlight. To achieve this, a small amount of energy was shifted away from the visible spectrum, which makes the bulb appear warmer, or more reddish, to the human eye. This tradeoff is well worth it, as the improved UV balance better supports hormone regulation, natural behaviors, and activity levels in your pet."