How to Hang LED Grow Lights the right way

How to Hang LED Grow Lights the Right Way

Learning how to hang your LED grow lights is an excellent start towards creating the most productive light environment for your horticulture business. Though many growers get it wrong.

When learning how to hang your grow lights the right way, you should:

  • Consider light uniformity before hanging your grow lights
  • Put together a grow light plan
  • Determine your grow light hang height
  • Ensure efficient grow light installation

Rendering from a Humitsu LED Grow Light professional grow light plan

This article will help you save time and money when hanging your grow lights, and hopefully provide peace of mind that you’re on the right track.

Let’s get started.

Consider Light Uniformity When Hanging Your Grow Lights

Getting an even amount of light to all of your plants simply means your plants will also grow evenly. Otherwise known as light uniformity, this even distribution of photons is a vital part of any growth strategy.

Growlight grower
Why is Light Uniformity Beneficial For Your Business?

Uniform light distribution ensures:

  • Higher yields
  • More consistent crop quality
  • An easier time managing your grow environment

Although a couple of these benefits seem less tangible, they all contribute to more consistent plant products, which in turn gain a better brand name for your business. The most consistent plant products are desired by consumers and, therefore, can be used to better profit your operation through more robust retailer relationships.

First, let’s consider the dimensions of your grow room, including crop canopy, perimeters, benches, racks, and aisles. We’ll only be optimizing light uniformity for your crop canopy. Any light that falls into your corridors or shines on other equipment will be lost. Worse yet, you’ll continue to pay for this light loss with high energy bills.

Some find it easier to think of hanging their light fixtures as installing irrigation systems. If you had overhead sprinklers that sprayed water all over the place, that wouldn’t be an efficient use of water, and would be downright messy!

Now that you understand how vital light uniformity can be, we’ll want to plan for the right amount of coverage for your crop canopy.


Photo: Growlight fixtures hung in an ideal density to minimize any edge effects

Put Together a Grow Light Plan

A grow light plan will give you an idea of how many grow light fixtures you need for your space and can help you calculate the best hanging strategy for your grow lights.

For commercial growers, it’s essential that you get a professional light plan before you hang your lights. A professional light plan takes into consideration your crop canopy and target light intensity (also known as PPFD).

LED Grow Light Scientist
Grow Light Coverage Area Calculator

To calculate the coverage area per grow light fixture, you’ll need to know the light output (PPF) for your light fixture, and your target light intensity at your crop canopy (PPFD).

The equation goes: Light output of the fixture (measured in µmol/s) ÷ Desired light intensity at plant canopy (measured in μmol·m−2·s−1) = Coverage area per grow light fixture (measured in m2).

Example: 1800 µmol/s per fixture (PPF of a sample Humitsu Growlight fixture) ÷ 800 μmol·m−2·s−1 = 2.25 m2 (Coverage area per grow light fixture).

This equation is only for estimate purposes, we always recommend a professional Humitsu Grow light plan be made to accurately estimate light intensities, as results may vary.

How Far Should Grow Lights Be From Plants?

This is a common question when deciding how to hang your grow lights. Though, hang height is only a minor factor in planning lighting for commercial spaces.

Surprisingly, how close your grow lights are to your plants has little to no effect on the amount of light your crops receive in a large space because the light beams overlap.

Again, think about light as water pouring from your ceiling. The higher the source of water won’t affect the amount of water that hits your plants.


Light is hard for people to imagine. It can be helpful to think of light the same way you think of sprinklers.

The difficulty when thinking about how high to hang your lights comes when considering your walls and aisles.

Determine Your Grow Light Hang Height

Every environment has unique challenges that a good light plan can mitigate. For instance, low ceilings and small crop canopies can experience bad uniformity. This lack of uniformity results in what horticultural lighting experts call “hotspots.”

High ceilings often have the opposite problem of losing too much light to the walls and aisles, called the “edge effect”. Many growers are familiar with the edge effect because crops along the edge of the canopy often differ in quality and yield less compared to the rest of the canopy.

Recommending the right distance between your grow lights and plants is not a one-size-fits-all approach. The best thing to do is to contact your LED grow light company for these recommendations.

With Humitsu LED Grow Light, we mitigate any hotspots or edge effects in our commercial grow light plans.

If you’re working with a small canopy, the best recommendation we can give is to reduce your light spacing from the calculation above by 15%. This should be adequate for reducing any edge effect due to the higher ratio of walls and floor space to plant canopy.


Rendering from Humitsu LED Grow Light professional light plan showing heat map with edge effect in a commercial plant cultivation

Ensure efficient grow light installation

Most commercial cultivators hire electrical contractors to install their grow lights. This can be a significant added expense.

Our TopLight and BarLight grow lights reduce this expense by coming standard with quick-connects to easily install or replace LED grow lights with minimal help from an electrician.

Also, it is crucial to give your professional grow light plan to your electrician so you can minimize labor and materials. Electricians can use your light plan to map out their installation beforehand, saving time that would be spent figuring it out on-site.

We’re Always Here to Help

As you begin planning to hang your grow lights, we’ll be here to help.

Our light planning specialists are experienced with all types of lighting environments. When you’re ready to start your grow light plan, our team can get you going quickly and reliably.

Enough said, let’s get growing!

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