Light Calculations

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Answer

Approximate Lumen Output = Candle Power x 12.57

Footcandles * 10.764 = lumens / square meter = lux

Lumens * .07958 = spherical candle power

Lux * .0929 = foot candles

Power Calculations

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Answer

Power = Voltage * current ( watts = volts * amps)

Current = power / voltage (amps = watts / volts)

Unit Conversions

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Answer

Inches = millimeters / 25.4

Millimeters = inches * 25.4

Feet = meters / .3048

Meters = feet * .3048

Centigrade = .556 * (fahrenheit – 32)

Fahrenheit = 1.8 * (centigrade + 32)

Length / Voltage Drop Calculations

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Answer

Calculation: V = I x L x (R/1000) * 1.004

V = voltage drop

I = current

L = length of conductor in feet

R = resistance of conductor per 100 feet

  • R / 18awg = 6.51
  • R / 16awg = 4.09
  • R / 14awg = 2.58
  • R / 12awg = 1.62
  • R / 10awg = 1.02
  • R /   8awg = 0.64