IES - Illuminating Engineering Society
...BY DORMERS JITKA MOHELNIKOVA Dormers have found wide applications in the design of new buildings and also in the renovation of under-roof spaces in existing buildings. Comfort and illuminance for visual activity in attic rooms illuminated by dormers depends mainly on the dormer dimensions and its position with respect of the utilization area of the room. See #1.
WideLite
...mercury electric-discharge lamp in which a phosphor coating transforms some of the ultraviolet energy generated by the discharge into light. Footcandle (fc) The unit of illuminance when the foot is taken as the unit of length. It is the illuminance on a surface one square foot in area on which there is a uniformly distributed flux of one lumen. See #2.
An Explination Of Scotopically Enhanced Full Spectrum Lighting By Light Energy Source
Pupil size changed with both light level and the type of spectrum illuminating the subject's eyes. However, when the average pupil size variation was compared with the test illuminance variation at the eye (measured with a conventional light meter) there was no correlation. On the other hand, a near perfect correlation was obtained when... See #3.
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elliptipar... there is no equal
Let us assume that we have determined (by hand calculation, computer model or similar procedure) that 10 units, each with one 250W lamp, are required to achieve the desired illuminance level at the work plane. Step 1 Tentatively locate the luminaires in plan. Mounting on both 40' long walls, 10 units can be distributed 5 units per side, ... See #4.
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Osram Sylvania, Inc.
...This is the ability of the eye to adjust to changes in luminance by making the pupil larger or smaller. It means we can see correctly across a wide range of illuminance values. The time taken to adapt in this way is largely determined by the luminances at the start and end of the adaptation process. This adaptation takes... See #5.
Osram Ltd
In most cases, standby power generators are used and these then supply power to the normal luminaires. The generators must guarantee at least 10% of the illuminance recommended for the activity. There are three types of safety lighting: Safety lighting for escape routes; safe evacuation calls for a minimum illuminance... See #6.
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LDPI Technical Information on Fluorescent, Incandescent and HID Lamps
Fluorescent system efficiency is increased due to high frequency lamp operation. Foot candles (FC) - The English unit of measurement of the illuminance (or light level) on a surface. One foot candle is equal to one lumen per square foot. Harmonic Distortion (THD) - A harmonic is a sinusoidal component... See #7.
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