What is a maintenance factor?

As well as lumen depreciation, dust/dirt accumulation on light fittings and room surfaces will affect light levels in the intervals between cleaning. To account for these (and other variables) a "maintenance factor" is used in lighting designs. This is a number ranging from 0-1 (typically 0.8 is used for LED products by default)and it is multiplied by the results of the design calculations with the aim of simulating lux levels at a particular point in product lifetime/cleaning cycles. This is almost always taken to be the mid-point unless stated otherwise. It is important to consider that if you are comparing designs with the same maintenance factor and one product has a much longer lifetime than the other, the light levels from the longer lifespan product will remain higher than the simulated maintenance factor for longer.

Our lights are used by

BookerBrewdogSantanderDupontGlenfiddichSparLogoplasteLogainairNHSLothian BusesWabtecWalkers
Customer Reviews Bg
  • I am delighted to have used Kellwood...

    - P. Nisbet, Wabtec Corporation

  • a project that was well planned and promptly accomplished

    - E. McHugh, Loganair

  • Where others let us down, Kellwood did not

    W. Coley, Barking Abbey School

  • ...my client is over the moon with the end results

    A. Fraser, MacLean Electrical

  • I'd certainly recommend them

    V. Richardson, Stolle Europe

  • I'm more than pleased with the guys. I'd recommend them to anyone

    G. Gray, Logoplaste

RecolightScottish Engineering