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.