Proper UVB Light distance?

I am looking to put a UVB light fixture inside of my beardie's terrarium. The light that I am planning on using is a Zoo Med ReptiSun 10.0 UVB T5HO 22' fluorescent tube. By my measurements, the spot that I plan to put it should be 9-10 inches from my beardie's basking spot. I am not using any kind of reflector. Does this sound like a safe distance to put the light?

Thank you to any who respond.

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This is Atlas, he's my 3 year male leatherback. i don't know whether to be worried as he has no femoral pores what so ever, not even small ones! i always thought they would come with age but he is getting a bit older now and i'm starting to worry. here are some photos of his lack of pores. if someone could let me know if this is healthy that would be greatly appreciated!!
I don't own Swordtail anymore. He owns me
Swordtail is being the chonky turd he is
Hmmm.... May make a dress for her lol

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