How to choose LED Domestic Bulb

Although LED lights are placing great penetration into market, not everyone know exactly how to choose a right LED Domestic Bulb.? Normal customer will feel confuse how to read the label of a light product. This article aims to give you some information to be a smart customer.
First，which data determine the brightness level of the light, wattage or lumens? Normal customer has the misunderstanding that high wattage indicates the higher brightness level. Actually it is not the fact. When you are purchasing a light, in fact you are purchasing the Luminous flux, so look into the data of Lumens per wattage on the label.
When purchasing a new light, a majority of customer will take reference of the old light which needs to be placed. The brightness level can be calculated by multiplying the wattages data of the old bulb by the lumens per wattage. Then take reference of this data and to purchase the corresponding LED replacement bulb.
Different lighting sources have different illumination efficiency. You can have a look at the form below.

Lighting source	Illumination efficiency (lumens per wattage)
Incandescent bulb	15
Fluorescent	20-25
LED	20 or more

Then, many people have the question, the LED lights claims to be energy efficient, but not know how to calculate its power consumption.
Multi the wattage of the fixture by the cost of electricity in cents per kilowatt hour, then divide by 1000 to get the cost per hour. Take our LED 240V 6W LED B22 Warm White Globe for example, its wattage data is 6W. Then its cost per hour is 6W* 25 cents per kilowatt-hour/1000= 0.15 cents. That is to said, it creates 0.15 cents electricity bills per hour.
You can also taking considering with the purchasing cost of a bulb. Also take the LED 240V 6W LED B22 Warm White Globe for example, you purchase one at $25.14, then its service life is 30,000hrs. Here introduce a concept of depreciation which means the allocation of the cost of assets to periods in which the assets are used. So the depreciation rate of this LED Domestic Bulb is $25.14/30,000= $0.000838=0.0838cents. That is to say, a LED 6W B22 Domestics bulb would cost 0.15 cents of electricity cost and 0.0838 cents purchasing cost per, which equivalent to 0.23 cents per hours.