Lumens (denoted by lm) are a measure of the total amount of visible light (to the human eye) from a lamp or light source. The higher the lumen rating the “brighter” the lamp will appear.

How Do Lumens Compare to Watts?

Watts and lumens measure two different things. Wattage measures the amount of electrical power the light bulb consumes. So the brightness of the bulb was estimated based on how much power it required.

Lumens, on the other hand, measures the actual brightness — regardless of how much power is needed. Buying a light based on lumens is actually a more accurate way to determine the brightness than buying a light based on wattage.

How Many Lumens Do I Need for Outdoor Lighting?

The amount of lumens you need for your outdoor lighting really depends on the kind of outdoor lighting you want.

Our suggestion on lumens for various Solar outdoor lights includes:

How to Calculate Lumens per Watt for a Solar LED light?

The formula to calculate lm is :

Lumens (lm) = Watts*Lumens per Watt

For Example:

The LED wattage of a 20 Watt Solar Street Light is 20 W and 1 W = 160 Lumens for a Solar LED Light.

Lumens (lm) = 20*160 = 3200 lm.