UVB bulb

We just changed to a larger enclosure (34 W x 40 H). Been using a 15W, 5.0, 18 in UVB bulb. I don't plan on getting a larger light as I'll need room on top for the rain dome I hope to get. I did just get a 15W, 10.0 figuring it would have better penetration in a larger cage. Thoughts?
 
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