So i read this on a web page which makes it more confusing
Though the number of lumens per watt is a useful calculation, it can sometimes be deceiving depending on the type of lighting to which it applies. LED lights, for example, use focused light energy and thus require fewer lumens to produce the same intensity of light. If you were to compare an LED light fixture rated at 400 lumens, you might be tempted to select another kind of bulb because it has a higher lumen rating. In reality, that LED fixture could actually produce a higher intensity of light despite using as little as half the lumens of other fixtures.