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Despite both light sources being present in the horticultural industry for decades, the heated debate on HID lights vs LED lights for growing persists on. LED lights are engineered to mimic the specific wavelengths responsible for stimulating photosynthesis. HID grow lights, on the other hand, are more affordable and provide sufficient UltraViolet light to successfully grow crops.

Here’s an in-depth look at each one of them.

HID Lights vs LED Lights for Growing: Which is Best?

What to Know About LED Lights

A Light Emitting Diode (LED) consists of systematically arranged semiconductors that emit light through electrical current. During the 70s, tomato indoor farmers tried this technology for the first time and were awed by its impressive yields. The main reason is that LED grow lights rapidly stimulate photosynthesis and are adaptable to different plant stages.

Are LED Lights Good for Plants?

Diodes or Semiconductors produce light when an electrical current passes through the circuit board. This system tremendously minimizes heat production because it relies on a small amount of electrical current to generate light. It’s the reason why a majority of grow tent kits contain one or two LED growing lights.

Clones and seedlings are highly sensitive to intense light. LED growing lights operate at different modes so that the cultivator can adjust light intensity to suit the plant’s needs. This crucial feature lowers production costs because growers don’t have to purchase extra lights for nurturing young plants.

What to Know About HID Lights

High Intensity Discharge lights emit light when a high voltage of electricity jumps between two electrodes. The space in between the electrodes contains gasses such as mercury and sodium which evaporate rapidly and produce bright light when conducting electrical current. High Pressure Sodium and metal halide bulbs belong in this category.

Are HID Lights Good for Plants?

HID lights have established a positive reputation since the late 60’s based on their ability to produce full-spectrum UV light. They’re also affordable to purchase compared to LED lights however, they have a higher power consumption rate. First-time growers also need a little training on how to use the lights to prevent crops from drying up due to overheating.

How Far Should a 1,000 Watt HID Light Be Away From The Plants?

The mode of light production causes a high rate of heat emission by HID growing lights. This causes rapid transpiration leading to death. The potting soil also loses water rapidly through evaporation. Experts advise suspending HID bulbs at least five feet above the crops to provide light safely.

Frequently Asked Questions on HID Lights vs LED Lights for Growing

1. Are HID Lights Brighter Than LED?

A lumen is a unit used to quantify visible light. HID and LED growing lights tend to have similar output since each can produce 8,000-10,000 lumens. LED lights, however, have the advantage of output control while HID lights lack this feature.

2. What Runs Hotter: LED or HID?

HID growing lights, as mentioned earlier, require high voltage to conduct electricity between the electrodes found inside the bulbs. This is the main reason why cultivators suspend HID bulbs five feet or more above the crops. A 1,000-watt LED growing light will safely provide light when mounted three feet above the plants.

3. Do LED Grow Lights Yield More Than HPS Grow Lights?

The late ’60s saw hundreds of indoor growers ditching HID bulbs in favor of the latest invention at the time, LED growing bulbs. As mentioned earlier, LEDs are designed to produce specific wavelengths of UltraViolet rays that stimulate a high rate of photosynthesis. This results in plants generating chemical energy in abundance thereby growing into healthy robust crops and yielding bumper harvests.

4. Are HID Grow Lights More Reliable Than LED Lights for Results?

A few manufacturers have produced HID grow bulbs that somehow replicate wavelengths produced by LEDs. The market statistics, however, indicate that LED grow lights dominate other sources of indoor horticultural lighting. In other words, a majority of customers trust LEDs to yield higher Returns On Investment (ROI) than HID grow lights.

5. Are HID Grow Lights More Affordable than LED Grow Lights?

LED grow lights cost twice as much as HIDs, sometimes even higher. Maintenance costs, however, differ since LED lights require servicing once every 5-10 years. A cultivator has to purchase HIDs after 15-18 months since oxidation affects the bulb’s ability to emit light.

hid lights vs led lights for growing

Which Is Better: LED or HID Grow Lights?

The hot debate on HID Lights vs LED Lights for Growing starts by highlighting the pros and cons of each device.

Advantages of LED

1. Emits Sufficient Penetrative Light Under Thick Canopies

Horticultural experts invest in LEDs since they provide light in various wavelengths for different sections of the plants. Canopies, for instance, thrive under purple light while the undergrowth requires green and yellow wavelengths. HID bulbs, unfortunately, emit broad spectrum white UV light.

2. Best Option for Short-Season Crops

Research indicates that HID grow lights consume thrice the amount of electricity compared to LEDs. A cultivator growing crops that mature within 12 weeks spends considerably less money on power bills annually than a farmer relying on HIDs.

3. LED Grow Lights Emit A Minimum Amount of Heat

As discussed earlier, HPS lights require a higher distance between them and the plants compared to LEDs. A cultivator using HID grow lights incurs higher power bills due to the extra cost of regulating temperature using fans. The farmer faces a higher risk of losing the crops due to overheating, which is why experts recommend LED grow lights to first-time indoor growers.

4. LEDs Provide Better ROI for Commercial Growers

LED grow lights provide two major benefits to commercial farmers that can’t be matched by HIDs. The ability to stimulate a higher rate of photosynthesis enhances the crop’s ability to achieve its full potential and this boosts overall yields significantly. The second advantage is LEDs produce better penetrative light than HID grow lights, and this directly contributes to impressive outputs per season.

5. LEDs Are Designed For Small Spaces

Grow tent manufacturers produce a variety of small kits containing LED growing lights because plants can grow safely without overheating. Small grow kits allow cultivators to experiment with different varieties of crops or create cloning tents. It’s quite challenging to manage temperatures inside a 24 x 24 x48 tent when HIDs are involved, due to keeping a safe distance between the bulbs and crops.

Are there drawbacks to using LED grow lights?

1. Frequent Exposure to Blue and Purple Light Causes Eye Damage

The blue and purple light produced by LEDs for growing affects how the retina functions. This part of the eye converts light that enters through the pupil into electrical signals directed toward the brain. Frequent exposure causes blurred vision as well as increases the chances of getting cataracts.

Cultivators can avoid eye problems associated with LED growing lights by wearing protective grow room goggles. They’re quite affordable and most grow kit sellers provide them for free.

Pros and Cons of HID Growing Lights

1. Affordability

HID growing lights cost 50-70% less than LEDs and this makes it more affordable for indoor growers to set up simple personal or commercial grow rooms. Growers also don’t have to necessarily spend extra money on equipment for mounting HIDs.

2. Recommended For Extremely Cold Climates

Winter strikes harder in some geographical regions compared to others. Crops cannot thrive in chilly weather since cold temperatures impede photosynthesis. A grower can make the indoor environment more conducive by purchasing a set of HID lights to provide some warmth for the crops.

LED growing panels are highly sensitive to extreme weather. This makes them a high risk since they’re expensive to replace.

3. Suitable for Plants That Bloom Easily

Vegetable crops such as broccoli and kale don’t require a huge difference in light spectrums while blooming. HID growing lights can provide sufficient light to promote growth and the cultivator spends less money on equipment in comparison to purchasing full spectrum LED growing lights.

What are the disadvantages of using HID growing lights?

1. Unsuitable for Hot and Highly Humid Environments

The heat generated consistently by HID lights can dramatically affect plants growing inside a highly humid grow room. Such external conditions are conducive to mold infestation and bring unwanted decays to the crops.

2. Growing Tall Plants Is A Challenge While Using HID Lights

Some crops can grow up to six feet tall and the main challenge that arises is insufficient penetrative light to foliage that’s below the canopy. HID lights require four to five feet of distance from the plants, and light penetration becomes harder whenever the crops grow taller. Such drawbacks have a negative impact on the crop’s output.

3. Cleaning HID Grow Lights Is A Taxing Job

It takes more effort to clean up a commercial grow room that has this mode of lighting compared to LEDs. Cleaning the bulbs is time-consuming because one has to handle the glass cautiously. HID bulbs use large metal reflectors to maximize light reflection directed toward crops. These attachments increase the workload and overall tedious task compared to owning LED grow light panels.

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