Why is a 3W LED torch much brighter than 25W or higher wattage LED flashlight?

1. 1ST quality LED chip from, for example, CREE can offer 100~110 Lm/W
2. Cheaper chip from lower-class suppliers can only offer 45~50 Lm/W

That's why even though more wattage is consumed to burn the LED chip, but it’s not as bright as expected.

Result:
A. If the LED chip efficiency is over 100 LM/W, congratulation, you have a quality and Energy Conservation product.
B. If the LED chip efficiency is under 100 LM/W, you can have it at cheaper price.

The second trick is,

Heat, is the main issue in LED technology. Heat not only shortens the LED chip’s life, but also decreases Lumens of LEDs.