Too much is when the light will fog your paper in the time between taking it out of the box and putting it in the fixer. As long as you do a fog test to see how long it takes your safe light to fog the paper, there is no reason it can't be very bright. As long as noticeable fog doesn't occur in your normal printing time range.
This is kind of relevant. The room at my college that we used to coat screen printing screens with emulsion had a gigantic window. Screen printing emulsions are cured by UV light, so the proper yellow film was applied to the window so little to no UV light penetrated. There was a ton of light in the room from the huge window. As long as you didn't leave your freshly coated screen out for hours at at time, the emulsion was not negatively impacted.