Publications

IES LD+A Research Matters: Optimizing Building Design and Operations

CLTC Studies: Optimizing Building Design and Operations. A laboratory room within CLTC demonstrating various lighting and daylighting technologies and integrated building controls.
11/19/2019

Designers, owners and operators are all faced with a myriad of decisions on how best to achieve their building design and operational goals. Complex and often conflicting objectives can make even the simplest decisions appear challenging. Take, for example, thermal comfort. According to the Department of Energy, adjusting temperature set points by just one degree for an eight-hour workday can save commercial building owners 3% in energy costs. This equates to thousands of dollars in savings each year. Clearly, the least costly alternative is to not heat or cool a building.

IES LD+A Research Matters: Studying chromaticity binning - what should we expect from today’s LED light sources?

Four table lamps being tested and used for chromaticity binning studies.
08/15/2019

Generally, people expect two light sources with the same rated color appearance to appear identical when installed in their homes and businesses. Obvious variation often leads to dissatisfaction, complaints and product returns.  To avoid these issues, it is important that light sources have sufficient chromatic consistency to ensure color matching for most people.  Currently, the lighting industry relies on binning for correlated color temperature (CCT) and Duv to address this issue.

IES LD+A Research Matters: Circadian Lighting Design - Leveraging the Melanopic Efficacy of Luminous Radiation Metric

Health workers walking down a hospital corridor with path lighting.
05/06/2019

Lighting design projects often include multiple design constraints. For example, a lighting design should meet target light levels, limit glare and provide appropriate color fidelity while not exceeding the power or energy budget defined for the project. For select projects, circadian considerations have recently been added to the design criteria list. Circadian lighting is defined as lighting that influences a non-visual, physiological response within the human body.

Nonresidential Lighting: What's New in 2019 Title 24, Part 6 Energy Code?

Banner for What's New - Nonresidential Lighting document. Man unloading produce in the produce section of a grocery store.
02/04/2019

California's new nonresidential Building Energy Efficiency Standards take effect on January 1, 2020. The 2019 Energy Standards focus on several key areas to improve the energy efficiency of newly constructed buildings, additions and alterations to existing buildings.  Significant changes in the 2019 Energy Standards address ventilation, HVAC, demand response and lighting. Notably, the 2019 Energy Standards now include requirements for healthcare facilities, although there are many exceptions for this building type.

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