THEORY: Color, Light, & Texture
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The document covers key concepts in lighting design, including the definitions and relationships between lumens, footcandles, and candlepower. It explains how these measurements relate to illuminance and the color matching system, specifically the Pantone system. Additionally, it highlights the importance of standardized color reproduction for manufacturers.
THEORY: Color, Light, & Texture
- 1. Theory of Architecture 1 Light, color, & texture
- 25. 5 minute break
- 26. LIGHTING DESIGN
- 42. Cornice Light
- 57. Lumens
- 58. Lumens • The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source. Luminous flux differs from power (radiant flux) in that radiant flux includes all electromagnetic waves emitted, while luminous flux is weighted according to a model of the human eye's sensitivity to various wavelengths. Lumens are related to lux in that one lux is one lumen per square meter. • The lumen is defined in relation to the candela as • 1 lm = 1 cd⋅sr.
- 60. Footcandle
- 61. Footcandle The name "footcandle" conveys "the illuminance cast on a surface by a one-candela source one foot away". sometimes foot candle; abbreviated fc, lm/ft2, or sometimes ft-c
- 62. ETC • RADIANCE is another way of saying how much energy is released from that light source. • ILLUMINANCE is what results from the use of light. You turn your flashlight on in a dark room, and you light something up. That's ILLUMINANCE. Turning on a light in a dark room to make the burglar visible gives you ILLUMINANCE.
- 63. ETC • Candlepower is a way of measuring how much light is produced by a light bulb, LED or by striking an arc in a Carbon-Arc spotlight. • A candlepower as a unit of measure is not the same as a foot-candle. A candlepower is a measurement of the light at the source, not at the object you light up. • And a candela is the metric equivalent of the light output of that one candle, based on metric calculations.
- 64. • Summing it all up: • Candlepower is a rating of light output at the source, using English measurements. • Foot-candles are a measurement of light at an illuminated object. • Lumens are a metric equivalent to foot-candles in that they are measured at an object you want to illuminate. • Divide the number of lumens you have produced, or are capable of producing, by 12.57 and you get the candlepower equivalent of that light source. • We've now converted a measurement taken some distance from the illuminated object, converted it from a metric standard to an English unit of measure, and further converted it from a measure of illumination to a measure ofradiation!
- 66. 10% Total Area of Room (Natural Lighting)
- 70. New Frontier • Zoological Lighting
- 72. Pantone • The Pantone Color Matching System is largely a standardized color reproduction system. By standardizing the colors, different manufacturers in different locations can all refer to the Pantone system to make sure colors match without direct contact with one another.
- 80. 5 minute break