To minimize obtrusive light, EN 12464 not only gives limitations for ULR values but also for luminous intensity values in obtrusive directions and light trespass into windows. These limitations depend on the environmental zone category as well. Limitations for light trespass into windows are given in lux. Values can easily be calculated with calculation points and calculation surfaces. To calculate luminous intensity values in obtrusive directions DIALux offers Luminous Intensity Calculation Points. Such points can be placed just like any other calculation points. They consider all luminous intensities of all light emitting surfaces of all placed luminaires. So for a luminaire with two brackets two values are calculated. DIALux uses the luminaire’s LDC in the installed position, the luminaire flux, the dimming level and the corrections factor, if applicable, for calculation. A Luminous Intensity Calculation Point can be placed for each potential obtrusive direction.
Fig. 309 Luminous intensity calculation point
Fig. 310 Property page for the outputs of the luminous intensity calculation point
The luminous intensity calculation point output can be reduced to such luminaires and light emitting surfaces that do not hold a given limitation.
