Zilla 11521 36-Inch Desert 50 UVB T5 Fluorescent Bulb, 21-Watt

They really good for UV. They however are not very bright in the visible spectrum.

I'm very disappointed in these UVB bulbs from Zilla. We purchased 20 two bulb combo fixtures from Zilla which have one Daylight bulb and one UVB bulb. Within about 3-5 months all of the UVB bulbs had burned out. Most burned out within 3 months, two bulbs just finally died this past week (at the 5 month mark). The daylight bulbs have lasted longer, only one of them has burned out so far. I would personally not buy this product or recommend it to others.

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This package arrived and i could immediately tell that the bulb box had been opened and re-taped at the bottom. There was also the unmistakable sound of broken glass. The inner bulb box packing material was missing from the one end I opened. I didn't look any further because upon opening, bulb/glass powder floated out and pieces of bulb were visible down towards the bottom of the box.

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I have no idea whether this bulb worked well or not since it was not 36' and wouldn't fit in my fixture. This bulb is about 32 inches long and 1/2-3/4 inches in diameter, so make sure it will fit your light fixture before you order it.

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Bulb is described as 36-inches; actual length is 34-inches. Probably best for use with Zilla light fixtures only. I don't have a Zilla light fixture.

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