Energy Efficiency in LED Signage Displays: On, Sleep, and Off Measurement Checklist

Measure real power at the sign’s AC input in on, sleep, and off modes, then multiply each mode’s average watts by its operating hours. Include the equipment dedicated to the sign and record what stays powered when the display goes dark.

Define what the meter covers

For a procurement or commissioning comparison, use the same measurement boundary for every configuration. Where the installation permits it, measure upstream of the sign’s power supplies and include dedicated controllers, media players, and other accessories needed for normal operation. If a controller or network device serves several signs, document whether its consumption is measured separately and how any share is allocated. Have a qualified person arrange metering for hardwired installations.

Record the installed module or strip model, quantity or length, power supplies, controller settings, and operating schedule. Check the actual datasheets and control documentation before selecting brightness settings, test scenes, or shutdown methods. HansonLed’s edge-lit catalog lists an Edge Lit LED Module for Box. When evaluating a light box, include the assembled face and graphics in the comparison so the power readings reflect configurations that meet the same visibility and uniformity requirements. HansonLed edge-lit LED module catalog

Measure each operating mode

On mode

Measure the sign at the brightness and content settings specified for normal operation. For a static sign, let the reading settle and record the average over a defined interval. For animation or video, log a representative playlist or a complete repeating sequence. If the sign uses different daytime and nighttime brightness settings, measure them separately and assign hours to each. Record any permitted high-load scene separately for electrical design review, since it serves a different purpose from the typical-use average.

Sleep mode

Enter sleep through the schedule, controller, or remote command the operator will actually use, where supported. Wait for the transition to finish and record average real watts. If the system periodically polls a network or wakes for updates, use a logging interval that captures those events. Record which devices remain available and verify that the sign wakes as scheduled with the correct content and brightness.

Off mode

Use the project’s specified off command or switching arrangement and record what remains energized inside the measurement boundary. An off command can leave a power supply, timer, or controller energized. If the approved design also provides a supply-disconnect state, document that state separately and account for any dedicated equipment fed elsewhere. Use an instrument suitable for the expected low load and record readings below its reliable range as such.

Match the test content to the RGB control system

With whole-module RGB control, the emitters in a module or shared control zone follow the same color command. Measure the colors and brightness levels the sign will actually use. HansonLed’s RGB catalog lists both an RGB 3 LED Module and an RGBW LED Module. Verify the channel configuration and supported settings in the selected model’s documentation before choosing test scenes. HansonLed RGB LED module catalog

Individually addressable RGB control can assign different colors and brightness levels to separate pixels at the same time. HansonLed describes independently addressable pixels on its pixel module page. Confirm the selected model’s addressing granularity and controller compatibility, then log the actual animation loop, including bright and dark scenes in their normal proportions. Measure a black scene separately if the operator plans to use it for blanking, since the electronics may remain active. HansonLed pixel LED module catalog

Commissioning checklist

1. Document the metering point, equipment included, and any separately powered loads.

2. Use a meter that reports real watts and accumulated energy, with suitable accuracy at low loads.

3. Record the on-mode brightness, scene or playlist, averaging interval, and average watts for each operating preset.

4. Measure settled sleep and off states, document what stays energized, and verify scheduled wake-up.

5. Record weekday, weekend, and seasonal hours where they differ. Check that every hour belongs to one measured state.

6. Multiply average watts by annual hours for each state, add the results, and divide by 1,000 to estimate annual kilowatt-hours. If transitions contribute materially, include them in the logged energy or account for them separately.

Frequently asked questions

Can I estimate annual energy from the module’s rated wattage?

Use the datasheet rating for the design checks it supports. For an operating energy estimate, use measured AC input and scheduled hours. That measurement captures the power supplies and dedicated controls within the defined boundary.

Should a black screen count as sleep?

Count it as sleep only if the sign has entered its configured sleep state. If the controller is still playing a black frame, log that as powered blanking and measure its draw under the actual settings.

How should I compare two bids for the same sign?

Ask both suppliers to report watts at the same system boundary and under equivalent sign-face visibility, content, and scheduling conditions. Compare annual kilowatt-hours alongside wake-up behavior and any required remote access during closed hours.