Cable Calculator

Constant Current Cable Calculator

Total Wattage of Lights (W)

Cable Length (m) — the loop, there and back

Conductor CSA

Current

Volt Drop -

Total Power -

Driver Output -

350mA — Standard current for all Hudson Lighting products.
Driver Output — The voltage the driver needs to supply to overcome cable losses and power the lights.
Under 120V DC — Circuit must stay within extra low voltage limits. If exceeded, split into multiple circuits.

Work out the longest cable run you can achieve for a given set of lights, driver and cable size.

Light Fitting

Watts

Qty

Fitting	Watts	Qty	Subtotal
Total Circuit Wattage	0 W

Driver

Operating Current

Cable Size (Conductor CSA)

Driver max voltage — Derived from the driver’s maximum wattage rating and operating current.
LED voltage — The voltage your lights need, calculated from total wattage ÷ current.
Spare voltage — The remaining voltage budget available for cable losses (capped at 120V DC ELV limit).
Max cable run — The longest single cable run (one-way distance from driver to last light) achievable before the driver runs out of voltage headroom.
If your run is longer than the maximum, consider splitting into multiple circuits or using a larger cable size.