Update: 02/25/20 B remains unchanged. Arcadia is still working on making zoning possible. I can easily run this lightbulb for more than 6 months. I'm new to reptiles and tried this lightbulb. All initial UV Index readings looked good. Not as high as others tested. Noticed some behavioral changes (bearded dragons) after about 4 months. It is noted that the UV Index has fallen below 5.0. Love the bulb, I expected a longer life from it, but if that's part of your UV needs, don't extend the life. If you're looking for warm-up temps first, I think this lamp will last a little longer. I also use a combination of Arcadia 12% and 14% T5 UVB fluors. In short, they fall off a bit even after 4 months of use. Until something better shows up I will continue to use this product!
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