Like all screen tops, our 4x2x2 enclosure top blocks some UVB - approximately 38%. You can account for this block by moving the elevating the basking spot closer to the light fixture or using a stronger UVB bulb, according to the species you're caring for. You can also hang the UV light fixture inside of the enclosure by using the top support bars to avoid blocking any UVB.
Does the 4x2x2 (120 Gallon) Reptile Enclosure screen top block any UVB?
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