Orluna Lighting Supply & Specification

Every selectable fitting, beam and colour temperature uses its own published Orluna IES file. We sum the candela distributions at each surface point, using the inverse square law, the true distance and angle of incidence. The average and sampled peak use a regular grid over the room’s free measurement surface. Furniture above that plane is excluded; furniture volumes cast direct-light shadows.

All fittings point vertically downwards, including adjustable models. The beam outline is its published full half-peak angle; light continues beyond it. The published lumen figure uses the manufacturer’s IES header. Lux and reflected energy use the supplied candela table directly; its integrated flux can differ from that header figure. Lumens and lux scale with luminous output. The output controls are not a prediction of a particular dimmer’s percentage setting.

We trace the IES light onto finite room surfaces, then solve repeated diffuse reflections with reciprocal, energy-conserving surface exchange. The ceiling reflects about 80%, painted walls 65%, oak floor 25% and upholstery 35%; these are explicit model assumptions for our example rooms. A window lets light leave the room; lowering its blind adds a reflecting surface. Furniture uses the same simplified solid volumes as the shadows. A cached irradiance grid supplies both the room preview and its reflected lux. Flat surfaces use their normal direction; rounded details blend the nearest axis directions. This finite resolution preview estimates diffuse reflection rather than glossy highlights, mirror reflections or glare. We retain each fitting’s real light distribution and a fixed 100 cd/m² display reference: removing lights never changes the camera exposure. Daytime models the real window as a diffuse area source and includes its direct and reflected light in room lux. Our example uses 5,000 lx incident at the window, 70% glazing transmission and neutral diffuse sky light; this is a stated sky condition, not a location or weather prediction. The example sheer passes 35% of light and reflects 45%; blackout passes none and reflects 45%. Partial closure applies those properties only to the covered window area. Actual glazing, fabric and sky conditions need their own measured values. During blind travel the picture blends between calculated states; the settled picture and lux use the same field. Beam & lux remains the single fitting’s direct photometric calculation. Your screen cannot reproduce actual luminance or colour; final design checks the specified finishes, complete geometry, glare and installation details.

Measured options: Curve Fixed, Curve Adjustable, Infinity Midi Fixed with black baffle and Fina Fixed; Origin Natural, 2700K or 3000K. Other engines, finishes and aim angles need their own design checks.