A power supply's wattage is only one part of the plan. Your display also depends on the limits of the controller, each output, the connectors, and the wire connecting everything together.
Start with your actual equipment
Write down the pixel model, voltage, number of pixels on each output, cable lengths, and planned brightness. Use specifications for those exact pixels. Different pixel designs can draw different current, even when they look similar.
Add the loads that share each power supply and controller bank. Check the supply's rating and any temperature or installation requirements that reduce its usable output. Leave the operating margin its manufacturer recommends instead of applying one percentage to every supply.
Check the whole path
- Confirm the pixel voltage matches the supply and controller setup.
- Check both the total load and the load on each controller bank.
- Check each output's current limit separately from its supported pixel count.
- Check cable, connector, and fuse ratings along that output.
- Allow for any other equipment powered from the same supply.
Brightness is a setting, not a fuse
Lower brightness can reduce demand, but the effect depends on the pixel design. A sequence setting also does not replace correctly sized wiring and circuit protection. Test modes, configuration changes, or faults may behave differently from your normal sequence.
After calculating the plan, verify the assembled installation at its intended operating settings. If you add more pixels later, repeat the checks before connecting them. Spare physical ports do not necessarily mean spare power capacity.
Mattos tip: Leave room in the power budget and check every part carrying that power.
Keep learning
Read the full Mattos guide · Browse all Tips and Tricks
Technical references
Adapted from the Mattos Designs lighting-tip series. Need help with your setup? Email Support@Mattosdesigns.com with your equipment details.
