Lighting calculations can initially seem quite simple to perform using today’s computer based calculation programs. But it takes an experienced lighting planner to make correct assumptions and premises, and also to interpret the results. Normally several adjustments have to be made before you receive an optimal result. It’s important to perform genuine calculations for your installation.
During rehabilitation it’s important to consider lamp heights and possible “extended mounting brackets”. By switching from old mercury lamps to high pressure sodium lamps it is often possible to decrease one “step” of the installed lamp effect (W) and still provide for today’s demands for lighting. In these situations lighting calculations should be carried out with an independent counsellor.
With a new installation lighting calculations are to be documented so that all demands are being fulfilled.
When building new installations you are free to optimize your installation dependent on lamp height and relative placement of the columns.
Which demands are to be met when carrying out lighting calculations?
- Independent of the supplier - Adjustments to the present road geometry and surface - That it uses the same lamps in the in the planned installation as those used in the calculation.
When ownership is transferred/accepted, measurements should be carried out on the installation to verify that the actual lighting level relates to the deliverable lighting calculations!