Tools
Lighting calculators
Each tool uses one formula and returns a number with a unit. Empty, zero, or negative inputs show an error next to the field. The last numbers stay in this browser, and each result can copy a link to the same fields. The estimate does not certify a lamp.
Headlight aim / beam drop
Trigonometry from lamp height, wall distance, and drop or angle.
Open the aim calculatorLamp current and fuse
I = P / V, then a fuse suggestion from current × 1.25.
Open the current calculatorLED vs halogen draw
Watt and amp differences from two sets you enter.
Open the comparisonMulti-lamp current budget
Sum amperes across two to six circuits and show spare capacity.
Open the budget calculatorLight at a distance
E ∝ 1/d² for a point source. Not headlamp photometry.
Open the distance modelWattage from volts and amps
P = V × I, the inverse of the current calculator.
Open the wattage calculatorWall-chart aim helper
The same aiming geometry with a cutoff-line field.
Open the wall-chart helper