We now carry the 50ft, 75 ft and 100ft viewing distance photoluminescent signs. These signs do not require electricity, are non-toxic, non-radioactive, and are very easy to install. We have models that are UL Listed and value models that are ETL listed to UL's 924 standard. The photoluminescent sign charges via the ambient light of the room which is then discharged when in darkness. The signs come with several framing options and arrow configurations. Generally the signs are charged using unfilter fluorescent lights. We do have a new 75-ft viewing distance rated model that is UL-US and Canada Listed and can be charged using 3 light source types: unfiltered fluorescent, Metal Halide or Mercury Vapor. All the signs require 5ft candles of light to be on the face of the sign during building occupancy to charge the signs. The average office space has over 20x this amount of light so satisfying this requirement should not be a problem.