Maximize Energy Savings with Controlled LED Lighting
Bi-Level Dimming (BLD) incorporates multiple controls and functions to give greater control over the lighting and energy usage in a given area. The system automatically raises and lowers light levels based on the occupancy and needs of the consumer with a variety of customizable settings that can be configured in the field for effortless energy savings.
Strategic Implementation: While LEDs are incredibly efficient on their own, it is the combination of LEDs and energy saving controls that are taking the industry to the next level. If used strategically, Bi-Level Dimming has the potential to dramatically reduce the number of watts used in a given day while still maintaining minimum light levels…all of which can be configured in the field for optimal personalization to save you money and much needed time.
Four Types of Control
The system is an advanced combination of four main controls:
- An occupancy sensor with an adjustable detection range
- A timer with two customizable periods of waiting time (motion hold time and stand-by period)
- A customizable three-step dimming control (1. ON:100%; 2. Dimmed: 10%, 20%, 30% & 50% Output; 3. OFF)
- An adjustable daylight (photo) sensor, which measures the amount of natural/ambient light in the given area.
Most popularly used for the “step dim” function…
Ex. 1: Multifamily corridors – Fully lit 24/7 - 100% light output will remain consistent during high traffic hours as motion is regularly detected (mornings/evenings). Lights will then dim to save energy after a set period of inactivity.
Ex. 2: Commercial office complex – Majority of corridor lights remain on 24/7 - Save energy by automatically dimming all or certain groups of fixtures throughout the day and after-hours when no movement is detected.
Ex. 3: Self-storage complex – Interiors typically lit 24/7 - Common areas and hallways are frequently left unoccupied throughout the day and night. Remain secure and save energy in a dimmed state. When a presence is detected, lights will switch on to full output.
Ex. 4: Stairwells – Typically lit 24/7 but frequently unoccupied - Remain secure and save energy in a dimmed state. When a presence is detected, lights will switch on to full output.
The unit has a series of DIP switches that allow simple adjustment in five areas of control; Detection Range, Hold Time, Daylight Sensor, Stand-by Period and Stand-by Dimming Level.
The occupancy sensor’s detection radius is approximately 19’6”, at 30 degrees to 150 degrees from the perpendicular center of the fixture, with a maximum mounting height of 19’6”. The sensor can be set to cover approximately 100%, 75%, 50%, or 10% of this area. The microwave based sensor operates at 5.8 GHz (+/- 0.75MHz). Due strictly to their mass, it is not recommended for use in lobbies with elevators. The unit ships with the factory setting at 100%.
When movement is detected, the fixture turns ON to 100% light output. It will remain at full brightness for the set “hold time,” which can be as short as 5 seconds and as long as 30 minutes. Once the hold time ends, the light is reduced to the stand-by dimming level (see “Stand-by Dimming Level” below). The unit ships with the factory setting at 1 minute.
DAYLIGHT (PHOTO) SENSOR
The “daylight sensor” evaluates the amount of surrounding light in range. Measured in Lux, the sensor determines if the surrounding light in the given area meets the field configured minimum light threshold. If movement is detected and the surrounding light is below the set Lux threshold, the fixture will trigger ON and the hold time will begin. If movement is detected and the surrounding light is above the set Lux threshold, the fixture will not trigger on. The sensor can be set at 2Lux, 10Lux, 50Lux, or it can be DISABLED. If disabled, the fixture will trigger ON when movement is detected regardless of the amount of surrounding light. The unit ships with the factory setting at DISABLE.
Once the hold time has elapsed, the “stand-by period” begins, which is the length of time that the fixture remains in its dimmed state (Stand-by Dimming Level). At the end of the set stand-by period (10 seconds up to 1 hour), the fixture will turn OFF. If you do not want the fixture to turn completely off, use the “+8” setting, which will keep the fixture in its dimmed state continuously until movement is detected again (useful in 24-hour burn applications). If you wish to bypass the step dim and have the fixture turn completely OFF at the end of hold time, use the setting “0 seconds.” The unit ships with the factory setting in the continuous dim position “+∞”.
STAND-BY DIMMING LEVEL
When the set hold time has elapsed and no further movement is detected in range, the dimming control reduces the light output to the set “stand-by dimming level,” which can be configured at 10%, 20%, 30% or 50% light output. The fixture will remain at the reduced level for the length of the stand-by period (see “Stand-by Period”), or until movement is detected, whichever comes first. The unit ships with the factory setting at 50%. *Dim percentage is an approximation of light output, it does not equate to fixture wattage draw. Contact Brownlee Lighting for wattage calculations.
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