Typical Foot Candle (FC) and LUX Ratings

Light Levels

Outdoor FC LUX
Direct Sunlight 10,000 100,000
Full Daylight 1,000 10,000
Overcast Day 100 1,000
Dusk 10 100
Twilight 1 10
Deep Twilight 0.1 1
Full Moon 0.01 0.1
Quarter Moon 0.001 0.01
Moonless Night 0.0001 0.001
Overcast Night 0.00001 0.0001
Indoor FC LUX
Manufacturing Assembly Line
Rough 20 200
Fine 100 1,000
Very Fine 300 3,000
Retail Stores 50 500
Banks
Lobby 20 200
Tellers 50 500
Hospitals
Operating Room 1,800 18,000
Offices
General 30 300
Accounting 50 500

Average Parking Lot = 1 foot-candle or 10 lux

Full Video = 140 IRE units or 1 volt p-p

140 I.R.E. units
1 volt peak to peak
100 units of video (including pedestal)
0.7 volts of video (including pedestal)
(100 units of video = DVD quality video) 40 units of sync signal
0.3 volts of sync signal

Useable or Minimum Video Levels: 20% to 50% of a full video signal

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