BusiLED

Step 1Open the tool. There is nothing to install, and it keeps working without internet.

Step 2Enter the system voltage, the watts per metre and the length. Watch what happens if you switch from 24 to 12 volts: the same sign then draws twice the current and tolerates half the drop, so it needs four times the copper.

Step 3Enter how far the driver sits from the sign and what conductor you plan to use. The graph shows the voltage falling: a straight line along the cable, a curve along the strip. If the far end drops below the red line, the last letters burn visibly dimmer.

Step 4Feeding from both ends helps, but not equally everywhere: the cable drop halves and the strip drop goes to a quarter. That is why you do it for the strip, not for the cable. A second wire is usually cheaper than thicker copper over the whole run.

Step 5Watch the quality message. Green means sharp enough, red means the photo is too small.

Step 6Done, or something went wrong? Open the dashboard and start over with a clean sheet.