There are 4 major factors you need to consider:>
|Ceiling Height||Recommended Lumens Output|
|Under 12 ft||7800 - 9000 lumens|
|12-ft to 18-ft||13000 - 16000 lumens|
|18-ft to 24-ft||19500 - 24000 lumens|
|24-ft to 30-ft||26000 - 32000 lumens|
|30-ft to 35-ft||36000+ lumens|
You might hear the term Color Rendering Index or CRI as well. In simple term, it's the measurement of how true colors appear under the lights compare to how they will appear under sun. The higher the CRI the truer the representation. This matter if true color representation is important to you. Most commercial warehouse lighting are set to 80 CRI which is good enough for most application.
Picking the right energy efficient LED high bay lights for your space can help increase productivity and reduce eyestrain for your staff.
They are the same type but configured with different beam angle. Low bays are usually tuned at 120-degree beam angle and are used in open space with ceiling height up to 15 ft. They are ideal for showrooms, retail, and grocery stores. While High bay fixtures are configured with a beam angle of 90-degree or less and are installed over 15 ft. They typically produce over 20000 lumens and are perfect to replace traditional 400W metal halide or HPS lamps.
Aside from the fixture's shape, the main difference between a round and a linear fixture are the light distribution. The round version will yield more of a circular beam spread while the LED linear high bay lights produce a more rectangular shape. Linear fixtures are best suited for a more uniform lighting effect, like in corridors and warehouse shelving. Round fixtures are better suited for open spaces such as gymnasiums, hangars, and factories.
Metal Halide have been the most common choice for HID lamps. During its heyday, it was the crown jewel for energy efficient and long life bulb. Till this day, most factories and assembly plants are still using them. Yet, they are now to be considered as one of the most inefficient indoor industrial lighting option.
The two most used metal halide bulb wattages are 400W and 1000W. Today, a 100-Watt LED Retrofit Kit can easily replace the 400-Watt, and a 240W LED high bay can take-out the 1000-Watt version with ease.
They are 3 options you can retrofit to LED:
Know that not all LED fixtures are created equal. Two 240W high bays may not have the same lumens output.
The higher the lumens = The brighter it is = The more efficient it is.
This can be done by using better LED chips with higher efficacy.
Once you know how many lumens each fixture generates, we can determine the number of fixtures needed for the room. Depending on the application of your space, we can use 3-5 lumens (lm) per cubic feet (cuft.) as our parameter.
For the purpose of warehouse application, you would use close to 3 lm/cuft as your variable while a showroom will be more on the 5 lm/cuft for a brighter solution.
For the purpose of this exercise, let’s assume the following parameters.
Are you still overwhelmed?
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