If the above video does not play, try this link: Lens Design is Important This video is from a manufacturer, so you need to take the information with a bit skepticism, but it does show how the lamp watts are not the only thing that matters. A new high-end LED, the Cree XLamp XP-L, can be used at any wattage between 1 and 10, depending on the circuit. The designations, 1 watt, 3 watt and 5 watt are still used a lot, but the newer technology is muddying the water. Therefore they don’t produce the light you would expect based on the watt rating. It is common to run high watt bulbs at 40% or even lower. The reason manufacturers do this is because higher watt bulbs generate much more heat and this heat shortens the life of the bulb. You can have two 3 watt LED bulbs that produce very different amounts of light.
LED technology is moving ahead very fast and not all LED bulbs are of equal quality. A 100 watt light might actually have less useful light for plants than a 50 watt light. Unfortunately, it does not work that way for LED. Brand “A” at 20 watts is better than brand “B” at only 15 watts. If watts are an indication of brightness, then we should be able to use it as a way of comparing different types of LED grow lights and some manufacturers agree. A 100 watt light bulb is much brighter than a 60 watt light bulb and two different brands of 100 watt incandescent bulbs have about the same brightness, because they use mostly the same technology. Historically, consumers have used watts as a way to measure the amount of light produced by a light bulb. A watt is a unit of measure that describes the power used by an electrical circuit.
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