The Green Building Industry Is Solving the Wrong Problem With Lighting
As USGBC-CA announces its Net Zero Accelerator Cohort 8 this week, one question worth asking: Why do better lighting specifications keep losing at value engineering review?
By Sarah Morgan, CEO, Earthlight
Among the announcements being made this week at the USGBC-CA California Green Building Conference on the UC-Berkeley campus is the final cohort of the Net Zero Accelerator, a program designed to bring pilot-ready cleantech companies into the California green building ecosystem.
Earthlight applied.
The experience of applying, and the conversations it generated, brought to the surface something the lighting industry already knows but rarely says plainly: The problem with intelligent lighting designed to support circadian rhythm health is not the science. The science is settled. The problem is that nobody has made the financial case in language that survives a cost review.
The translation gap
Every commercial project pursuing WELL v2, Fitwel, or LEED certification has a value engineering review. Intelligent lighting, designed to support circadian rhythm health, is among the most commonly cut line items at that review.
It goes like this: The designer presents a specification. The cost consultant presents a spreadsheet. The specification loses.
California’s 2026 Title 24 update replaced Time Dependent Valuations with a Long-Term System Cost metric, a meaningful step toward whole-lifecycle energy evaluation. But LSC remains an economic and environmental calculation. It measures financial returns against upfront costs and grid impacts. It does not measure the most consequential cost of lighting: its effect on the people inside the building.
Learn more about WELL v2 lighting standards.
That gap is where specifications die.
What the math shows
A 100-employee office, 200 fixtures = $115,000 installed.
At a 5% discount rate over a 10-year horizon, applying a 65% light attribution factor to workforce health costs — sourced from the National Safety Council Fatigue Calculator, drawing on peer-reviewed research from Brigham & Women’s Hospital and Harvard — the numbers look like this:
Healthcare cost savings: $102,703 per year. Over 10 years: $1,027,030.
Energy savings: $12,000 per year. Over 10 years: $120,000.
Total 10-year net benefit: $1,032,030 against a $115,000 installation.
Combined payback: approximately 11 months. Return ratio: approximately 9:1.
Essentially, the specification that gets cut at VE review to save $115,000 destroys over $1,000,000 in lifetime value. The cost consultant in that room doesn’t know this. Neither does the developer. Because nobody has given them the calculation.
The industry’s role
Manufacturers, distributors, and specification consultants have spent years making the scientific case for human-centric lighting. The science is compelling. It is also, in a VE review, completely irrelevant.
The conversation that needs to happen is not about melanopic lux or circadian stimulus. It is about IRR, lifecycle cost, and risk-adjusted return. It is about framing a lighting specification as a CapEx investment with measurable OpEx and productivity impacts, not as a technical requirement.
WAC Lighting, Signify, Nano-Lit Technologies and others have done meaningful work on the product side. The gap is not the product. The gap is the financial model that makes the product defensible at the moment it matters most: the cost review.
What happens next
The NZA cohort announcement at the USGBC-CA California Green Building Conference highlights the companies that are bringing pilot-ready solutions to California’s green building market. Whether Earthlight is among them or not, the problem we’re solving doesn’t go away.
Intelligent lighting designed to support circadian rhythm health will keep getting cut from specifications until the industry speaks the language of the room it’s losing in — and that language is finance. The tools to speak it exist. The question is whether the industry uses them before another $1,000,000 in lifetime building value walks out the door.
About the author
Sarah Morgan is the founder and CEO of Earthlight, the software spinout of Nano-Lit Technologies. Earthlight builds financial intelligence tools for the built environment. Readers can join the Earthlight Intelligence Library, where lighting professionals get the financial tools to defend better specifications here. You can email Sarah Morgan at this address
