Many controversies and conflicting theories have risen from this research however general trends have been observed regarding luminance and task completion. Several studies have been conducted trying to determine the relationship between light quality and mood. Visual tasks, average accuracy, prolonged time period Working space where visual tasks are not often performed Table 2 outlines a range of light intensity based on the type of activity.The average ambient lighting in a standard room has an intensity of 500 lux. Generally there is a direct relationship between the amount of accuracy or speed required in a task and the desired light intensity. The required light intensity of a room is dependent on the tasks the work area is designated for as well as the eye quality of the worker. Figure 1 demonstrates the effect of distance on candela, the candela measured at points 1 and 2 is the same.įigure 4: Spectral (left) and diffuse (right)radiation Lighting Quality An interesting aspect of this measure is that the candela of a light source is independent of how far away it is measured, since angle is not affected by horizontal distance. This span is measured in steradian this measure has no unit and quantifies three dimensional angles. It corresponds to the amount of light emitted over an angular span. Table 1 outlines typical lumen values for lighting Light SourceĪ candela is a measure of light intensity. Lumen can be calculated by multiplying the intensity (in candela) by the angle. This quantity is independent of the light pattern (direction of the light) which means that high lumen measurements do not equate to high lighting quality. The addition of a reflective covering would only increase the candela and lux of the bulbĪ lumen is a measure of light flux, the rate of energy flow from the light source to its surroundings. There are three primary quantities that measure light intensity: lumen, candela and lux.
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