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Your UVB does not appear to be close enough to do any good, the Max range for effective UVB coverage of a ReptiSun 5.0 is 12" from a "New" unfiltered bulb. That range dissipates quickly as the bulb ages & is why they must be replaced regularly. As Pat mentioned, a 10.0 should have been the choice to give a bit further range. I suggest you either use smaller fixtures so you can arrange them better or figure out something more effective. Once again that enclosure is not suited for this application & those fixtures are not suited for the enclosure.