PRODUCTS - Mercury vapor street lights

Mercury vapor lamp is a gas discharge lamp that uses mercury in an excited state to produce light. For sake of comparison we will use a 60 watts mercury vapor street light, with following features

  • Life span 16,000 - 24000 Hrs
  • Power consumption - 60 watts
  • Required Beam angle - 360, considering pole height of 10 feet,

To calculate beam spread, Beam width = angle x. 018 x distance = 64.8 feet rectangle In the above scenario, 90 degree beam angle is wasted. We can calculate for 270 degree beam spread only.

Mercury vapor lamp gives 30 lumens per watt, totally flux-1800 lumens Lux = foot candle x 10.76 (for 10 feet pole height 1fc=100 lumens) = (18 x 10.76) 193.68

Lux/watt = 3.2