True, the relatively low level of UV is not usually an issue (although 14 hours is seriously pushing it, for example the dermalux is only rated eye safe for 4 hours on UV output).
But the real problem is that the human retina has photactive pigments that are activated by the violet light. These lamps produce manyfold more violet, and it has similar effects to UV. You *must* block these out almost 100% when using the lamp. They generate free radicals in your eye and they will over time damage your retina with no hope of recovery. You may well go blind.
Even 470nm blue light is thought to be somewhat dangerous.



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