NGLS Outdoor Evaluations

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NGLS Outdoor Parking Lot Systems Evaluations are scheduled for installation on individual parking lots at the Virginia Tech Corporate Research Center (adjacent to the Virginia Tech Transportation Institute, VTTI) in the summer of 2019.

Minimum Functionality Checklist

Systems must provide the following minimum functions.



Presence Detection Based Control. See specific performance criteria below.


User-defined Schedule-based Control (astronomical and time of day)


User-defined Zoning


Power and Energy Monitoring


Control Implemented via Easily Interchangeable Control Node


Monitoring of Individual Luminaire Electrical Performance


Remote Accessibility for Configuration, Monitoring and Control


Alarms/Notifications. See specific performance criteria below.


Either fixture-integrated or Pole Mounted Sensor Mounting Options




Systems will be evaluated on the ability to meet the presence detection performance, control node performance, and lighting performance criteria.

Presence Detection Performance Criteria
  1. Using  existing infrastructure for mounting presence sensors, detect presence over the largest possible parking lot footprint under the following circumstances:
    • Detect a walking pedestrian within the parking lot boundary and switch lights from low to high.
    • Detect a moving vehicle (both electric vehicle and internal combustion engine vehicle) within the parking lot boundary and switch lights from low to high.
    • Detect a person exiting a stationary car parked within the parking lot boundary and switch lights from low to high.
  2. Provide user adjustable presence detection time out setting from 4 minutes to 30 minutes.
  3. Provide immediate (within 1 second) luminaire response upon presence detection.
Control Node Performance Criteria
  1. Provide user adjustable continuous output settings from 10% to 100% of maximum light output.
  2. Limit maximum control node standby power to 2 watts.
  3. On loss of communication to control node, provide user configurable option for control node to continue to operate the luminaire according to one or more of the following: a) default schedule, b) photocell, c) always-on.
  4. Provide the following alarms/notifications: a) electrical fault, b) communication fault, c) energy performance out of bounds.
Lighting Performance Criteria

Minimum efficacy (lm/W)


Maximum CCT (K)


Minimum CRI


BUG Rating

U0, G2 or lower preferred

Light Loss Factor

0.88 * lumen maintenance (LLD) at 25,000 hours

Maintained minimum horizontal illuminance

0.2 fc

Max/min uniformity


Maintained minimum vertical illuminance

0.1 fc


A representative parking lot (shown below) provides typical mounting heights and site geometry.  Upon acceptance into the NGLS Evaluation, individual parking lots are assigned to entrants and specific site geometry and drawings are provided. 

Representative Parking Lot

Pole Height: 30 ft
1 luminaire per pole
Parking Space Width: 9 ft
Drive Lane Width: 24 ft
Poles shown in yellow on drawing.

Rendering of a parking lot.

Representative lot, not to scale

Rendering of a parking lot.