**3.4 Economic analysis**

Comprehensive economic study is carried out with the same methodology discussed is Section 2, but to estimate the financial benefits of using the proposed *Economic Applications for LED Lights in Industrial Sectors DOI: http://dx.doi.org/10.5772/intechopen.95412*

lighting automation system for the low traffic roads. The Study considers also Direct Benefit and Indirect Benefits [10] in order to evaluate the entire economic value of the system.

Assuming for low traffic; the vehicle flow is 400 vehicles per day [14], vehicle speed is 60 km/hour, zone distance is 400 meter, lighting pole span is 40 meter, LED fixture consumption per pole is 75 Watts [30] and electricity tariffs is typically (0.053\$) per kWh [29].

From the above assumptions, flow rate of the vehicle can be calculated to be 17 vehicles per hour. Considering worst road operation scenario, at which the 17 vehicles are driven with constant speed of 60 km/hour and equal distances from each other, it is obvious to conclude that one vehicle shall enter the first zone each 212 seconds and leaving the zone (400 meter) after approximately 24 seconds. Accordingly, the zone lighting fixtures shall be switched on for 29 seconds and switched of for 183 second approximately. From that, the percentage saving in power consumption using the proposed controller compared with the power consumption when road is illuminated continuously during the night is approximately 183 � 100/212 = 86% saving.

Considering 4 km low traffic road operating for typically 50 years, Direct benefits and Indirect benefits can be calculated as following:
