Evaluating Light Source Color Quality
In a recent webinar hosted by the U.S. Department of Energy Solid-State Lighting (SSL) Program, “DOE TM-30: What have we learned in the past two years,” the topic of TM-30-15 was once again discussed.
What is it?
For those of you who have not heard of TM-30, it’s a new method for evaluating a light source’s color rendition, published by the IES roughly two years ago. To evaluate average color rendition, TM-30 uses a two-metric system:
- Color Fidelity (Rf) = the accurate rendition of color so they appear as they would under familiar (reference) illuminants. Scores are between 0-100.
- Color Gamut (Rg) = the average level of saturation relative to familiar (reference) illuminants. Scores are between 60 and 140, when Rf > 60.
What’s the difference between TM-30, and the current method?
The current method was developed by the International Commission on Illumination’s (CIE’s) General Color Rendering Index Ra (CRI) and was developed more than 50 years ago, and has been unchanged in the last 40. It calculates the average of 14 color samples, while TM-30 calculates the average of 99 color samples taken from 105,000 real objects. Once the scores are calculated, they are represented in a visual graphic showing the hue and saturation changes:
It is not a required method for measuring CRI, but it is an approved one. If it proves to be more efficient, TM-30 may soon become the next required method. There are additional experiments being conducted to test chromaticity and illuminance effects to help us better understand the capabilities of TM-30.
Good lighting can make or break your indoor farming operation. Of all the factors that contribute to plant health, light is the most important. When growing plants indoors, you have the opportunity to completely control the light your plants receive. So, why not take...
With the right sports arena lighting, every game is an exciting experience. High quality arena lights reduce glare for cameras and spectators and create a comfortable sporting environment for athletes. So, how do you make sure your outdoor arena lights and indoor...
Emergency lighting is a requirement for your building to ensure safety when things go wrong. If there’s a fire, a utility outage, or a power failure, there are state and federal regulations, fire codes, insurance policies, and even Occupational Safety and Health...