Redwood Systems LED light control engine
Redwoods technology will provide both the ability to control the lights and to monitor energy usage at each light and other operating characteristics such as temperature. Stieglitz stated, We will offer richer sensor distribution and more control at each light.
The control aspect includes dimming lights when workers leave an area and tuning lights to a task. The system could also optimize energy use based on utility rates and pricing programs. And the instrumentation capability allows management of lumen depreciation and ensures the system doesnt over drive the lights.
The Redwood scheme will only be applicable in new construction or major remodels because it relies on a new way to distribute power to the lights. The company will offer centralized light driver systems that distribute DC power and a network link to each light.
Given the founding teams heritage in the network space, the system functions similarly to a computer network switch in a wiring closet. Installations will even link the central systems to lights via network cables in some cases.
A single pair of wires will carry both the constant-current DC power needed to power a light and a proprietary power-line communication network. For cable runs of 100 to 200 ft, the Category 5/6 cable used in networks can deliver the required 350 mA of current at 60VDC • meaning the system is classified as a low-voltage system from a regulatory perspective. For longer runs to 100m, the system will relay on moderately more expensive 18-guage wiring.
Centralizing the power supply offers several potential angles towards system cost savings and ROI. A single PFC (power factor correction) front-end stage supplies a DC voltage to each light channel where dedicated DC/DC converters drive the lights. Stieglitz claims the centralized PFC stage offers an 8:1 advantage relative to having a PFC stage at each light.
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