Most building owners think controls are a nice-to-have — something you add later if the budget allows. The data says otherwise.
Across 57 commercial exterior projects, adding lighting controls increased annual savings by $31.35 per fixture while only adding $78 to the per-fixture cost. The combined payback went from 2.6 years to 2.9 years.
That is 0.3 years of additional payback for a permanent upgrade that nearly doubles fixture lifespan.
How controls save money
Controls save energy three ways that stack on top of LED savings:
**Dimming during unoccupied hours.** Parking lots are fully lit 12 hours a night, but foot traffic drops dramatically after 10pm. Controls dim fixtures to 30% output during low-traffic periods, saving 155.8 kWh per fixture per year.
**Motion-triggered restoration.** When someone enters a dimmed zone, sensors restore full brightness instantly. This covers approximately 10% of overnight hours — enough for safety without wasting energy on empty lots.
**Deferred replacement.** Running fixtures at reduced output extends their rated life from 11.4 years to 19.7 years. Over a 20-year period, that eliminates an entire replacement cycle — saving $53,391 per average project.
The value stack
At $0.12/kWh, controls deliver $31.35 per fixture per year:
Daintree ONE — the right tier for exterior
After analyzing three Daintree tiers against our portfolio data, the standalone sensor (Daintree ONE) delivers the best ROI for exterior parking applications:
The networked tiers (Zone + LCM, WANSI) add cloud monitoring and portfolio-wide visibility, but the payback extends to 4.4-5.6 years. For most exterior applications, the standalone sensor delivers the financial return while the networked options deliver operational visibility.
When controls make sense
Controls make sense when three conditions are met:
The site has exterior lighting that runs on a fixed schedule — which is nearly every commercial property. The utility rate is above $0.08/kWh — which covers the entire Southeast. And the fixtures are already LED or being retrofitted — which means the install labor is already happening.
When all three conditions exist, adding controls during the LED retrofit is the highest-return decision available. The incremental cost is minimal, the payback barely changes, and the 20-year value is substantial.
What this means for building owners
If you are planning or considering an LED retrofit, the question to ask your contractor is not whether controls are worth it. The question is why they did not include them in the first proposal.
We include controls analysis in every project assessment. If the numbers work — and they almost always do for exterior — we recommend it. If they do not, we tell you that too.