How do I read a seller of significant errors on the product information?

How do I read a seller of significant errors on the product information?

1. You can compare the lights before you start to purchase, firstly read the description of wattage, lumens, quality, sizes, the cover of the light, or its advantages of lights. A necessary test after you have purchased the light is also considerate. For example, compare the luminous efficiency between two light is also a way to present the truth.
Normally for the luminous efficiency:
Halogen is 10-15lumen per watt
LED is 50-80lumens per watt
CFL is 5-125/60-80 lumens per watt
What is the luminous efficacy going on?
How well a light source produces visible light is so called Luminous efficacy to measure. It is the ratio of luminous flux to power. Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source. Now let's choose two kinds of lights, wattage from 8 to 16, then to distinguish luminous efficacy between them.

As you have read the E27 product explanation about luminous efficacy as above, they are same products but different lifespan because of functions are different. As the no.4 wattage is 16, lumens is 590-980, lifespan is reached 150000. For surely it's the most luminous efficacy light when compare others. So I got the conclusion is that the higher the wattage is, the brighter the light will be.

2. There are some sellers claiming that their MR16's wattage could reach 12W. As Philip and cree are well known lighting company, let's see what are the highest wattages of MR16 can be reached between them.
Please take a look at below two, MR16 wattage in Philip is just reached 10W, and Cree MR16 reached 12W, what a surprise, from those two I have figured something out are that sometimes you can find significant errors on the product information, how they describe the products, compare the one you read with others about veracity.