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Lamps

  • Lamps-commonly called light bulbs-produce light. When comparing lamps, it's important to understand the following performance characteristics:
  • Color Rendering Index (CRI) - a measurement of a light source's accuracy in rendering different colors when compared to a reference light source with the same correlated color temperature. The highest attainable CRI is 100. Lamps with CRIs above 70 are typically used in office and living environments.

  • Correlated Color Temperature (CCT) - a measurement on the Kelvin (K) scale that indicates the warmth or coolness of a lamp's color appearance. The higher the color temperature, the cooler the color appearance. Typically, a CCT rating below 3200 K is considered warm, while a rating above 4000 K is considered cool.

  • Efficacy - the ratio of light output (lumens) to input power (watts). The higher the efficacy, the more efficient the lamp.

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Figure 110: Every lamp represents an opportunity to be more energy efficient.

Basically, you should try to use the most efficient lamp possible while maintaining the proper color rendering qualities required by a specific lighting application.

  • Lamp types include:
  • Incandescent Lamps

  • Fluorescent Lamps

  • Compact Fluorescent Lamps

  • High Intensity Discharge Lamps

  • Low-Pressure Sodium Lamps

  • Solid-State Lighting

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