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Quickly convert illuminance units including lux (lx), foot-candles (fc), and phots (ph).
Prime and Composite Number Calculator
Instantly identify prime, composite, or special numbers. Supports batch checking and mathematical property analysis.
Circle Area Calculator
Quickly calculate the area of a circle by entering the radius, diameter, or circumference. Supports custom units and precision settings.
Least Common Multiple (LCM) Calculator
Quickly calculate the least common multiple (LCM) of two or more integers. Supports space-separated number list input.
Inverse Trigonometric Function Calculator
Accurately calculate radian values for inverse trig functions like arcsin and arccos. Supports 6 function types and custom decimal precision.
Prime and Composite Number Calculator
Instantly identify prime, composite, or special numbers. Supports batch checking and mathematical property analysis.
Circle Area Calculator
Quickly calculate the area of a circle by entering the radius, diameter, or circumference. Supports custom units and precision settings.
Least Common Multiple (LCM) Calculator
Quickly calculate the least common multiple (LCM) of two or more integers. Supports space-separated number list input.
Inverse Trigonometric Function Calculator
Accurately calculate radian values for inverse trig functions like arcsin and arccos. Supports 6 function types and custom decimal precision.
Trigonometry Calculator
Calculate six trigonometric functions from radian values with custom decimal precision.
Solve your illuminance unit conversion challenges with a single click. Accurately convert between lux (lx), foot-candles (fc), phots (ph), and other units. We use international standard conversion factors to ensure accurate and reliable results.
Input values must be valid numbers; negative numbers and scientific notation are not supported. Conversion results are for reference only. For critical applications, please verify with actual measurements.
Architectural lighting design typically uses lux (lx) as the standard unit, while film and television lighting commonly uses foot-candles (fc). For reference, direct sunlight is approximately 100,000 lx, standard office lighting is 500 lx, and moonlight is only 0.1 to 0.3 lx.
