How to compare LED to Conventional Sources ( CFL, GLS Bulbs)?

In lighting terms, "Lumens" or "lm" is the measure of brightness. Where as, the measure of electrical consumption is "Watts" or "W". LEDs have the highest Lumen-to-Watt ratio as compared to any other light source. Thus, consuming less electrical power and flashing a brighter beam of light.

Also, LEDs have more than twice the life of an average CFL bulb and 15 times the lifespan of a conventional GLS Light Bulb. Thus, the higher price you pay for an LED light, lasts you longer and saves you more than 50% on your electricity bill when compared to CFL, and 85% as compared to Ordinary GLS Bulb. Which, in the long run, would be much easier on your pocket compared to changing electricity hungry bulbs every now and then,

 
  LED CFL Ordinary Bulb
Life (hrs.) 15,000 6,000 1,000
Lumens High Lower Lowest
Fragile Sturdy Fragile Very Fragile
Hazardous Material None Mercury None
Heat Medium Medium Highest
Switching Rate Fast Slight Delay Fast

For testing purposes, we compared the costs of using a LED and CFL for the exactly same scenario,

 
  CFL LED
Wattage 14 9
Brightness (Lumens) 720 810
Life (hrs.) 6000 15000
No. of Bulbs used (15000 hrs) 3 1
Cost per Bulb Rs. 170 Rs. 585
Total Cost of Bulbs Rs. 510 Rs. 585
Units of Electricity Consumed 210 135
Cost per unit (assumed) Rs. 8 Rs. 8
Electricity Cost Rs. 1680 Rs. 1080
Power Factor* 0.5 >0.9
Total Electricity Cost Rs. 3360 Rs. 1200
Total Cost Rs. 3870 Rs. 1785

Thus, Tintech LED is cheaper by Rs. 2085/- per lamp when compared to a CFL Lamp.



* - In AC circuits, the Power Factor is the ratio of the real power that is used to do work and the apparent power that is supplied to the circuit. The power factor can get values in the range from 0 to 1. When all the power is appropriately being used, the power factor is 1. Similarly, when all the power is reactive power with no real power (usually inductive load) - the powerfactor is 0.