• Inches = millimeters / 25.4
• Millimeters = inches * 25.4
• Feet = meters / 0.3048
• Meters = feet * 0.3048
• Centigrade = 0.556 * (Fahrenheit - 32)
• Fahrenheit = 1.8 * (Centigrade + 32)
• Pounds = kilograms * 2.205
• Kilograms = pounds * 0.454
• Degrees = 180 * radians / PI
• Radians = PI * degrees /180
  
  

POWER CALCULATIONS

• Power = Voltage * current (Watts = Volts * Amps)
• Current = Power / Voltage (Amps = Watts / Volts)
• RMS Volts = 0.707 * Peak Volts RMS Volts = 1.11 * Average Volts
  
  

• Lux = candela / distance in meters * distance in meters
• Foot-candles = candela / distance in feet * distance in feet
• Foot-candles = Lux / 10.764 = lumens/sq. meter
• Lumens/sq. ft. * 1 = foot-candles
• Lumens/sq. ft. * 10.764 = lumens/sq. meter
• Lumens * 0.07958 = spherical candle power
• Lux * 0.0929 = foot-candles
• Lambert * 0.3183 = candles/sq. cm
• Lambert * 295.720 = candles sq. ft.
• Lambert * 1 = lumens/sq. cm
  
  

• Foot-candles * 10.764 = lumens/sq. meter = lux
• Lumens/sq. ft. * 1 = foot-candles
• Lumens/sq. ft. * 10.764 = lumens/sq. meter
• Lumens * 0.07958 = spherical candle power
• Lux * 0.0929 = foot-candles
• Lambert * 0.3183 = candles/sq. cm
• Lambert * 295.720 = candles sq. ft.
• Lambert * 1 = lumens/sq. cm
  
  

• Beam diameter = distance * (2 * tan (beam angle / 2))
• Throw distance = Square root ((horizontal dist. * horizontal dist.) + (vertical dist. * vertical dist.))
• DC VOLTAGE DROP OF CONDUCTOR (cable) OF L
  
  

• V = voltage drop, I = current
• R = resistance of conductor per 1000 feet
• L = length of conductor in feet
• R for 18awg = 6.51, 16awg = 4.09, 14awg = 2.58
• 12awg = 1.62, 10awg = 1.02, 8awg = 0.64
• V = I * L * (R / 1000) * 1.004