Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Minimum Lux (lx)

Required number input.

Average Lux (lx)

Required number input.

Lighting uniformity ratio of minimum measured illuminance to average illuminance on the same measurement grid. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Uniformity Ratio

The resulting uniformity ratio returned as a number.

• Illuminance and lighting-power estimates depend on photometric files, geometry, reflectance, maintenance, daylight, controls, glare, spectrum, observer position, and code definitions. Lumens divided by area is not a complete lighting design.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Illuminance From Flux

  Average illuminance in lux from uniformly distributed luminous flux incident on a surface area.

• Cam Eccentricity

  Eccentricity of a disk cam from maximum and minimum measured radial distances to the rotation center.

• Deflection Limit Check

  Compare measured beam deflection with a supplied project-specific allowable deflection; also report the deflection-to-span ratio. This does not determine the allowable limit.