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A Guide For Simulating Natural Light

Advantages Of Full Spectrum Lighting

BasicBasic Ballast Information For 4 Ft. Fluorescent Lamps

Caring For Snakes

Checklist For Reductions In Utility Costs

Choosing the Right Lamp

Color Temperature & Color Rendering Index

Effects of Light on Children of Elementary School Age

Full Spectrum Lighting

Indoor Air Quality

Light - Medicine of the Future

Lighting For Aviculture

Lighting Industry Glossary

Reptile Lighting-A Current Perspective

Seeability Over Footcandles

Shedding Light on Those Winter Blues

Utility Cost Reduction Checklist

Vita-Lite: Indoor Gardening with Indoor Sunshine

Vita-Lite Lighting Brightens Vermont Classrooms

Color Temperature and Color Rendering Index

To choose the right color fluorescent lamp for a specific application, consider two things: (1) Color Temperature, and (2) Color Rendering Index.

Color Temperature is expressed in degrees Kelvin (K). For example, noon daylight is about 5500 degrees Kelvin – the same as the full spectrum Vita-Lite. Fluorescent lamps with lower color temperatures look red; fluorescents with higher color temperatures look blue. This makes sense if you imagine an iron bar being heated. First it gets "red hot." Then, as the temperature increases, it becomes "white hot" and finally, "blue white" hot.

Color Rendering Index (CRI) is a numerical system that rates the "color rendering" ability of fluroescent light in comparison with natural daylight, which has a CRI of 100. This means that a lamp with a CRI of 91 shows colors more naturally than a lamp with a CRI of 62. Most standard "cool white" fluorescent bulbs range 60 to 75 CRI. This rating method is recognized by the Illuminating Engineering Society (IES) and the Commission International de L'Eclairage (CIE).