How can I get lighting product catalogs and sell sheets?

a. The Document Library contains downloadable PDFs, including our latest full-line catalogs and product sell sheets with an in-depth overview of product specifications.

What are lamp BTUs?

a. British Thermal Units (BTUs) are a standard measurement of heat output. One BTU is the heat that will raise the temperature of one pound of water by one degree Fahrenheit. It is approximately the amount of heat generated by burning one blue-tipped kitchen match. There are approximately 3.4 BTUs per watt per hour. High bulb temperature usually will not affect the life of the lamp unless the temperature environment is extreme. The filament of an incandescent lamp operates at a very high temperature (nearly 4750 degrees Fahrenheit for a 200-watt standard lamp). An increase of a few hundred degrees in bulb temperature does not noticeably increase the filament temperature, and there is practically no effect on the lamp life or light output. Glass in most general service bulbs withstands 700 degrees Fahrenheit safely.

What is colour temperature, and how does it indicate to the colour of the light output from a lamp?

a. Color temperature (or correlated color temperature, CCT) is a number indicating the degree of yellowness or blueness of a white light source. Measured in kelvins, CCT represents the temperature an incandescent object (like a filament) must reach to mimic the color of the lamp. Yellowish-white (warm) sources, like incandescent lamps, have lower color temperatures in the 2700K-3000K range; white and bluish-white (cool) sources, such as cool white (4100K) and natural daylight (6000K), have higher color temperatures. The higher the color temperature the whiter, or bluer, the light will be.

How is quality of light determined?

Quality of light is determined by the relationship between the colour temperature of the light, and the color rendering index.

The colour temperature indicates the appearance created by the light source. The higher the colour temperature, the "cooler" the colour.

Typically, colour temperatures of 2000K -3000K create a warm (yellow) appearance; above 4000K are cool (blue) in appearance. Between 3000K and 4000K are considered intermediate and tend to be preferred.

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