What is the purpose of UL Design Guideline 24480?
What process was used to develop and approve UL Design Guideline 24480?
What is circadian-effective light?
What benefits does circadian-effective lighting provide to building owners and occupants?
How do I implement circadian-effective lighting?
What is the minimum exposure to circadian-effective light needed for circadian entrainment?
How much does it cost to implement circadian-effective lighting?
Circadian-effective lighting can be provided using the same daylighting techniques, electric light fixtures, and lighting controls as a specifier or designer would use to implement a lighting design to meet other modern visual and energy code criteria. No specialized lighting or control equipment is needed to provide circadian-effective lighting. Therefore, a lighting design meeting the criteria for circadian-effective lighting included in UL Design Guideline 24480 should not have a cost premium as compared to lighting designs that meet other applicable lighting guidelines, recommended practices, and building and energy code requirements.
Does circadian-effective lighting use more energy than traditional lighting design?
How can I implement circadian-effective lighting without causing glare for building occupants?
As with any lighting design, it is important to design circadian-effective lighting to minimize glare for building occupants. There are several strategies that a designer can use to help ensure that the lighting is visually comfortable. One strategy is to select lighting fixtures that provide good optical control of the light and limit direct view of the light emitting diode (LED) source within the fixture. The UL Design Guideline 24480 recommends that designers select a lighting fixture with a luminance below 8,500 candelas per square meter (c/m2) in order to limit the potential of the fixture causing glare for building occupants. A designer can also select light fixtures that distribute light indirectly onto building surfaces such as the ceiling and upper walls of the space. This will reduce the contrast between individual light fixtures and their surrounding surfaces, making them more comfortable to view.