Being exposed to a sun bed for 20 minutes a day is a risk being exposed to a small single tube for 10 mins a day indirectly is not a risk at all imo anyway.
The real risk from uvb tubes is to your eyes.
Always make sure you switch the uvb lamps of before you enter the grow area just to be safe.
Remember that the advice about skin cancer is from tanning beds that have maybe 40 high output tubes in them and the fact that some people use these beds for 20 minutes every day.
A single tube or even 2 will do you no harm(i think
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