Display Lighting

[RossThompson87]

Hi, I am currently working on a library project where the room has no display lighting.

However under the NCM methodology I am forced to enter a lumens/watt value for the display lighting in the room.

Is it acceptable practise to set the display lighting effeciency in the actual building to match the notional?

Thanks

Ross

[PCully]

Hi Ross,

The NCM Templates are created to best represent the different Building/space types but where the template blatantly doesn't match the usage of the room then I believe it is acceptable to choose another room activity (template) to better match. This would need to be justified of course.

I think your Accreditation scheme provider would be able to provide some further clarification on this but that is my understanding of it.

Phil

[Complex Potential]

Hi Ross

Taken from the Non Domestic EPC Conventions for England & Wales Issue 2.0: 1st January 2011:

Section 7.04 - Display Lighting
"Where zones incorporate an activity whereby SBEM automatically assumes the presence of display lighting but none is actually present, the display lighting efficiency for SBEM shall be entered such that it is the same as that of the general lighting present in that zone.
Where possible this should be calculated but as this requires detailed measurements of the lm and cW this is not usually practical in existing buildings. The following ‘default’ values should therefore be used:
1. For all general lamp types except Tungsten or Tungsten Halogen; you must enter that the display lighting uses efficient lamps and enter 50lm/cW in the relevant Lumens per circuit wattage box.
2. For Tungsten or Tungsten Halogen general lamps; you do not enter that the display lighting uses efficient lamps and you do not have to enter a value in the Lumens per circuit wattage box."

Better late than never

CP