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When choosing a new lighting system for long term success, it is critical to consider the following:

Illuminance levels: Illuminance is the amount of light reaching a surface as measured in units of “footcandles” (lumens per square foot). Recommended lighting levels can be derived from the IESNA Lighting handbook.

Light Loss Factors (LLF): LLF are used to adjust lighting calculations from a controlled laboratory environment to actual field conditions and/or from an initial installation condition to a maintained predetermined time frame condition.

  • Luminaire Dirt Depreciation (LDD): LDD is the accumulation of dirt on a luminaire resulting in a loss of light. Holophane’s glass optics resist electrostatic charges that attract dirt and dust. Wiping the glass during re-lamping will restore efficiency to 100%.
  • Lamp Lumen Depreciation (LLD): LLD is calculated by dividing mean lumens by initial lumens (values are readily available from lamp manufacturers). Different lamp sources have varying LLD values.
  • Thermal Factor: Higher luminaire mounting height generally results in hotter ambient operating temperature; this is especially true in spaces not air-conditioned. Holophane luminaires incorporate thermal management of the lamp and ballast to ensure 100% lumen output and dependable long term operation.
  • Ballast Factor (BF): A ballast factor of 1.0 represents a lamp that is operating at full wattage. BF less than 1.0 indicates a lamp will not receive the intended wattage, which results in lower light output. All Holophane manufactured HID ballasts have a BF of 1.0.


• Uniformity: Lighting uniformity is essential for all facilities to promote good visibility; however, certain tasks or areas may require different light levels.

• Contrast: Visibility is at maximum when contrast of an object with its background is very high. Higher illuminance through supplemental lighting may help compensate for poor contrast.

• Glare: Direct glare and reflected glare can have negative effects. Holophane trained lighting professions can assist in lighting design that promote greater visual comfort.

Color Rendering: The closer the color rendering index (CRI) is to 100, the more natural the colors will appear. Holophane can provide expert advice on the right type of lamps and CRI for applications ranging from retail to industrial.
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