![]() ![]() Solid-state lighting is the first generation of lighting equipment in which user-replaceable or interchangeable lamps are not desirable. Recoverable light loss factors are differences caused by lamp aging and effects of atmosphere, dirt, location, and other degrading environmental factors that can be "recovered" with new lamps and a good cleaning of the luminaire and room. Non-recoverable light loss factors are differences inherent to the lamp, ballast, room surfaces and thermal environment because the differences are always evident. These factors, called light loss factors (LLF), are scalar multipliers that account for differences in performance between the laboratory and field. Luminaire photometric testing is performed in a laboratory using a reference lamp and ballast, and then factors are applied to compensate for the actual lamps, ballasts and physical conditions of the design. Until the advent of solid-state lighting ( SSL or LED), lighting calculations evolved with the presumption that components could vary within the luminaire. Practitioners use both simple and advanced methods, but in either case, the input must include all of the proper data and adjustments relative to the project. These calculations allow one to predict lighting performance and whether the design meets current performance recommendations. A discussion of each of the factors and examples of comparative calculations are provided.Ĭalculations to predict lighting system performance are fundamental to the practice of lighting design and illuminating engineering. In order to properly predict the performance of an LED lighting system and to compare results to competing conventional lighting systems, designers must be particularly careful to use appropriate factors in addition to properly using the two different photometric data formats. With LED lighting systems, the photometric test method ("absolute photometry") differs from conventional source lighting ("relative photometry"). Good practice in illuminating engineering dictates that the designer uses photometric data that is adjusted to meet the conditions of the intended application by accounting for temperature, dirt, and variations of components. And you probably wouldn't want daylight over the dining room table or soft white in the kitchen.« Back to Homepage Lighting Calculations in the LED Eraīy James R Benya, PE, FIES, FIALD, Cree LED Lightingįor decades, lighting calculations have been the backbone of lighting designs for almost all lighting applications, indoors and out. In other words, you'd probably want daylight bulbs by your vanity or soft white bulbs in your bedroom. With that in mind, when choosing light bulbs for a room, think of what you normally do in that space and buy bulbs for that purpose. This light color will maximize contrast for colors, making it ideal for working, reading or applying makeup. Daylight (5,000 to 6,500 Kelvin) has a more bluish tone.With a less cozy and more energetic feel, bulbs with this color range are best for work spaces (such as a home office or garage) and kitchens with chrome fixtures. ![]() Bright white (4,000 to 5,000 Kelvin) is between white and blue tones.These bulbs are best suited for kitchens and bathrooms. Warm white (3,000 to 4,000 Kelvin) is more yellowish-white.This light gives a warm and cozy feeling and is often best for living rooms, dens and bedrooms. Soft white (2,700 to 3,000 Kelvin) is warm and yellow, the typical color range you get from incandescent bulbs.Here's a breakdown of light bulb color temperature: ![]()
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