It is possible to calculate the added benefit and/or the reduced cost of illuminating a parking lot based upon perceived brightness, for example, to 57 lux with either an HPS or with a 6500K LED lighting system; 57 lux was chosen because in a recent study this was the average illuminance
needed in a university parking lot for pedestrians to feel safe and secure under an HPS lighting system.
v] is the overall vertical illuminance
received by occupant's eye, lux, [L.
characterization, results were gathered from all screen printed and basic airbrushed devices but only three out of the five in-mold made parts illuminated over the whole area of the EL device; and of those three, all failed at the highest operating conditions (the values recorded during the test were the highest illuminance
achieved before failure).
This can be achieved with axially symmetrical light distributions with closely spaced illuminance
distribution perpendicular to the wall to effectively illuminate high walls and minimize spill light in the room (Figs.
Re_T5 and Sq_LED lightings were compared to each other at different illuminance
Peter Boyce, in his article "The Value Proposition-Changing Course on Benefits" in the November 2014 issue of LD+A, warns that "the emphasis in too much lighting practice is simply to meet [Handbook] illuminance
recommenda tions at minimum cost, the recommended illuminance
being taken as a proxy for benefits.
Based on roadway analysis, the utility can also make independent plots for the illuminance
or intensity of a single luminaire at a roadway surface.
Models based on the Unified Glare Rating (UGR) were found to be less accurate for both groups than more "basic" indicators of vertical illuminance
Consequently, it shows that performance indicators derived from the illuminance
distribution, also correspond.
Comparison of Simple Illuminance
Model Performances under Clear-Sky Conditions for Athens (Greece)
This is absolutely an illuminance
of 150 lux at a working height of 0.
Her concern was with the inadequacy of current lighting standards based on roadway illuminance
for ensuring the visibility of targets for drivers and for making the sidewalks appear safe to pedestrians.