Sometimes your working environment will determine how long your SoLux
bulbs lifespan is. When installed in a clean environment, they are
designed to last 4,000 hours or more while maintaining their original
light quality. If, however, there is dust or dirt in the air, these
materials may get inside the bulb reducing the brightness and possibly
changing the colour and quality of the light over time.
If your SoLux bulbs are getting old and you do start to notice that
the cover glass of the bulbs are getting foggy, glazed or diffused, this
is a good indication that it is time to replace them – they should be
relatively clear for you to get the correct colour temperature light
with an even spectral output.
GrafiLite tubes are rated for up to 10,000 hours under ideal
conditions, but the illumination quality will deteriorate over time, and
this will be exacerbated if the tubes are affected by dirt or dust in
Grafilite recommend that for best accuracy you replace your tubes annually to receive optimum colour accurate light quality.