LED Signage Energy Baselines for On, Sleep, and Off States

Measure real input power at the same electrical boundary in each state, then multiply the average watts by the hours spent in that state. A dark sign can still draw power when its supply, controller, or remote wake hardware remains energized.

Define what on, sleep, and off mean for the sign

Use these definitions in the quote, controls schedule, and commissioning record. If the interface labels a blanking command as off, document what that command actually switches. For sites with both dimmed and blank standby periods, give each its own row in the baseline if the operating hours and power draw differ.

Measure the installed system at a consistent boundary

Choose a measurement point that captures the loads the buyer wants to compare. A dedicated sign feed can include the power supplies, lighting, and controls connected downstream. If a timer, gateway, or controller has its own feed, meter its contribution separately where practical or document its exclusion. Use the same boundary in all states and for all bids or schedule options being compared.

Where the installation permits, use a meter or logger that reports real power in watts and accumulated energy in watt-hours. For hardwired equipment, have qualified personnel select the metering arrangement. Check that the instrument can resolve the expected sleep and off loads, and record its resolution if the display reads zero. Follow the actual equipment datasheets and site requirements when deciding how to dim, switch, or restore power.

After each state change, allow the system to settle before recording the steady load. When brightness or content changes, log a representative operating period and calculate the average. If startup or shutdown repeats often enough to affect the comparison, capture those events in a full schedule log so their energy is included once.

Choose an on-state profile that reflects the installation

Channel letters and edge-lit signs

For a fixed-output sign, measure the complete assembly at its normal operating setting. If the design supports separate daytime and evening levels, record the power and scheduled hours for each. HansonLed lists a Square Led Module in its channel-letter category and an LED Edge Light Module in its edge-lit category. Use the selected model datasheet to confirm compatibility with the proposed supply and any dimming controls. Channel letter LED modules and edge-lit LED modules.

Whole-module RGB and individually addressable pixels

With whole-module RGB control, the emitters within the module share a color command. With individually addressable RGB pixel control, the controller can assign separate colors and brightness levels to each addressable pixel. Confirm in the selected model datasheet what one address controls. HansonLed’s pixel module catalog lists an Addressable RGB Pixel. Pixel LED module catalog.

For a whole-module RGB sign, record the scheduled brand colors and brightness settings. For an addressable sign, meter a representative playlist across a complete loop, including any dark frames that occur during normal playback. Keep any separate high-load measurement for electrical design checks distinct from the playlist average used to estimate energy.

Calculate daily energy and check the proposed schedule

Add the watt-hours from each state and divide by 1,000 to obtain daily kilowatt-hours. For example, a hypothetical sign averaging 100 W for 10 hours on, 8 W for 6 hours in sleep, and 0 W for 8 hours off at the chosen boundary would use 1.048 kWh per day. Use separate daily profiles for weekends or other schedules when they differ materially.

Practical commissioning checklist

• Record the installed module, power supply, controller, and settings.

• Mark the meter location and account for separately supplied sign equipment.

• Log average watts and scheduled hours for every operating state and brightness level in use.

• Verify that the sign wakes as required and restores the intended brightness or playlist.

• Keep the readings and schedule together so later changes can be compared on the same basis.

Frequently asked questions

Can I estimate operating energy from module rated watts?

Use ratings for preliminary load planning within datasheet conditions. For the operating baseline, measure the assembled sign at its input so the estimate reflects supply losses, controls, and actual settings.

Does a black frame count as sleep?

A black frame during the normal playlist belongs in the on-state average. If the controller uses a sustained blank command as its scheduled sleep mode, measure that mode separately.

When is sleep preferable to switching off?

Sleep can suit sites that need remote wake or quick recovery, provided the equipment supports those functions. Compare measured energy over the scheduled idle period and verify that each proposed mode meets the site’s restart requirements.