How Many Lights Do I Need?
In order to calculate how many LED wall packs are needed for your outdoor lighting project, you need to know the basic principles that determine how light spreads from your chosen light source. Beam Angle and Beam Spread are the two LED Wall Pack specs we use to figure those quantities.
Beam Angle is defined as the point on the ground where light intensity is half of what it is when directly underneath the light source, known as the 50% point. The higher the light is off the ground, the longer the distance from the center to this point, so we can see the height chosen for the lights will also affect the number of LED Wall Packs required.
Beam Spread is the distance over the ground to the 50% point of each light. We use the specified Beam Angle, the chosen distance from the light source to the ground and some very simple math to calculate how many lights we need.
Beam Spread = Beam Angle × 00.018 × Distance from light to ground
In a typical example, a contractor wants to light a path along a 50-foot barn wall using wallpacks with a beam angle of 110°. His client wants the wallpacks 12 feet from the ground and the contractor knows the chosen LED Wall Pack has a beam angle of 110°. Plugging those numbers into the equation shows:
Beam Spread = 110 × 0.018 × 12 = 23.76 feet
The contractor needs to purchase two HyperWallPack135-50S lights to illuminate the path along the 50’ barn wall.
The Many Advantages of LED Wall Pack Lighting
LED Wall Pack lighting and LED lighting in general has become one of the most rapidly adopted new technologies in history. There are many reasons for that from its low cost of manufacturing, to our new ability to create lights in any shape, but the fundamental reason for LED lighting’s massive adoption is its drastically lower energy use than traditional incandescent lighting.
Using LED lights is a very simple way for everyone to do their bit for the planet by reducing the level of power plant emmissions required to light our homes, freeways, parking lots and offices.
Browse our website and see how many new, exciting LED lighting projects you can start today.
How Many Watts Do I Need?
The understanding that more wattage (more electrical power used) means more light output is most commonly reffered to when choosing lighting. Along with this most consumers have a good idea of the intensity difference between 40W, 60W and 100W light bulbs, which are the most common strengths used in a home. Similarly, buyers of traditional wall packs knew a 250W light would work for almost every outdoor application they had.
That all changed with LED lighting because of its biggest advantage over traditional incandescent lamps, namely the huge difference in electrical energy required to generate the same level of light. If you ever wondered about energy use and power, electrical energy use over time is defined as electrical power and is measured in Watts. A good rule of thumb to use when trying to figure light output based on your knowledge of incandescent lighting is the LED option will give the same light as a traditional light that has a wattage 4 times that of the LED. See the table below.
|Lumens||Incandescent Watts||LED Watts|
Light intensity has always been measured this way, but because all LED lights don’t have the same light output for their Wattage specs, the Lumen was added to the specification to allow buyers to compare actual light output across different brands and types of LED lights and compare them to traditional lights. Lumens roughly double from 40W to 60W and double again to 100W, so if you can remember a traditional 40W light gives you about 400 Lumens, it’s easy to work out 800 Lumens is equivalent to 60W and 1600 Lumens to 100W.
In all cases, higher Lumens values mean higher light output, so figure out your rough requirement, then pick the LED wall pack that gets you close to your needs.