Emergency lights with directional stickers

[Hyperion]

Often wondered why directional adhesive stickers are placed over emergency lights. Surely it would affect the lux? Any thoughts? 

[green-foam]

Maybe it is to direct the light to where it is required.

Have you an example picture?

[Hyperion]

 Its sited on the ceiling. 

[AnthonyB]

Often they are placed on them when they shouldn't be. The exit legend kits are for when a fitting is to be installed as an internally illuminated exit sign -  something separate from the provision of emergency lighting of escape routes, high risk tasks, etc, etc.

Too many untrained installers think because a light fitting includes a legend kit they have to put it on - far too many times I have to go around ripping them off so the correct illumination is provided.

[Hyperion]

Thanks for the replies. Confirmed my thoughts.