So, just a tip for people with tanks in their offices!Quick Story Time!
I had my 40g tank sitting closing to my desk a while ago once I just finished setting it up.
The light was not hitting me in anyways, well just a little bit, but I thought it was ok.
A month in I saw that my left arm (the side closer to the tank) was getting a bit darker than the right (and I have brown-ish skin) and it was very scratchy!
In conclusion... the Kessils even thou they are not hitting you directly or you are getting just a bit of light spill WILL GIVE YOU TAN!!! The light coming from the reflection and little light spill was enough to give me a tan.
The UV output on those lights are high, and I figure that on the worst way .
So, if you have one in your office.. just be careful and stay away from skin cancer .