How does the installation height of LED floodlights affect the required wattage?
Choosing the right wattage for a flood light isn't just about how big the area is; it has everything to do with how high up the fixture is going to be mounted. Light obeys the inverse-square law, which means that as light travels further away from its source, it spreads out and loses its intensity fast. If you put a low-wattage light too high, the beam will dissipate before it ever hits the ground, leaving you with a dim, hazy glow instead of crisp illumination.
If you are mounting lights relatively low, say around 3 to 5 meters (roughly 10 to 16 feet) high—which is typical for a backyard patio, a residential garage door, or a small walkway—you only need a modest amount of power. Something in the 10-to-50-watt range will give you plenty of bright, focused light without blinding your neighbors or creating uncomfortable glare.
As you move up to medium heights of 5 to 10 meters (around 16 to 32 feet) for things like commercial perimeters, small parking lots, or long driveways, you need to step up the power. A 100-watt fixture is usually the sweet spot here, providing a wide enough throw to cover a decent radius on the ground. However, once you get into high-mast territory—15 to 20 meters or higher (50 to 65+ feet) for major shipping yards, sports fields, or massive logistics hubs—you need heavy-duty commercial horsepower. You'll want to look at 300 watts or more to ensure the light has enough punch to travel that distance and deliver clear, safe visibility across a massive footprint.
