Lumen Method

[nero]

Hi

Can someone please expalin where MF and UF is taking from when calculating with the Lumen method.

cheers

 

[kamkam]

Maintenance factor = average output when dirty / output when clean

and should not fall below 0.8

 

[kamkam]

Utiilisation factor = total lux reaching a working space / the total lamp lux

the ratio depends on the room size and reflectance of the surfaces

 

[nero]

Maintenance factor = average output when dirty / output when clean

and should not fall below 0.8

Cheers..

What are the guidelies for MF, how do you work it out?

 

[kamkam]

measure the luminous flux ie

Lets say a 85w lamp has an output of 5700 lm and after a few months of service has fallen to 5200 lm

MF = 5200/5700 = 0.9

It will always be less than 1

calcs no worries but guidelines i am not 100%. I would give Thorn or Aurora a buzz on there tech line. Someone will be more than happy to talk to you for 3 hours about it!?!