Quickly estimate the lighting level or the number of lights needed for your interior projects.Depending on the dimensions of the room, whether the luminaires are suspended or not, the reflection and depreciation coefficients, test different combinations of luminaires and generic luminous fluxes.CALCULATION FORMULAS USEDLOCAL INDEXK = (A x B) / (H3 x (A + B))Explanations:A: length of the room in m.B: width of the room in m.H3: height of the luminaire above the useful plane in m.SUSPENSION REPORTJ = H2 / (H2 + H3)Explanations:H2: suspension height of the luminaire in m.H3: height of the luminaire above the useful plane in m.FACTORS FOR REFLECTIONThe light emitted by the luminaire is partly reflected by the walls of the illuminated room.The choice of reflection coefficients (in%) is left to the discretion of the user.Photometric classesThe photometric classes used in this application are predefined and correspond to the majority of products available on the market for the same range of devices.UTILANCERatio of the useful flow (received by the useful plane) to the total flow leaving the luminaires. Depending on the suspension ratio, the index of the room, the reflection factors and the photometric class, we determine the utility factor based on the NFC 71-121 standard.DEPRECIATION FACTORIn our calculations, we have taken into account the decrease in lamp flux (due to dust, wear, maintenance, etc.). We determined the depreciation factor based on the recommendations in effect.LUMINOUS FLOWF = (E x A x B x D) / (η x Ui)Explanations:E: illuminance requested in lux.A: length of the room in m.B: width of the room in m.D: depreciation factor.η: luminaire efficiency.Ui: utility factor.NUMBER OF LIGHTSN = F / fExplanations:N: number of luminaires.F: total luminous flux to be produced in lumens.f: luminous flux produced by a device.NOTE: The results obtained with this application are provided for information only and are intended as a quick decision-making aid. For a study strictly in accordance with the recommendations, it will be necessary to use lighting calculation software based on the photometric files of the selected devices
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