Do LED Grow Lights Use Less Electricity?

Whether you’re an individual or commercial grower, the size of your electricity bill is an important consideration.

You’ve probably heard that LED grow lights are more efficient than traditional grow lights like HPS and Fluorescent. However, do LED grow lights really use less electricity than their traditional counterparts?

This article will answer that question.

Do LED Grow Lights Use Less Electricity?

Short answer: Compared to HID grow lights, the short answer is YES, they do. However, the long answer is a little more complicated than that. Read on to find out why LED grow lights use less electricity than HID’s.

LED vs HID vs Fluorescent

The main comparison to be made here is really between LEDs and High-Intensity Discharge (HID) lighting. Fluorescent lighting uses much less electricity than both LED and HID grow lights. However, this comes at the expense of yield and quality, so we won’t include them in this comparison.

How to measure a grow lights efficiency

The most obvious way to measure the efficiency of a lighting system is by simply calculating the quantity of visible light produced (lumens) against the power (in watts) entering the actual light-producing part of the system (bulbs or diodes).

By this raw measure of efficiency, HIDS are more efficient than LEDs. HIDs produce an average of 120 lumens/watt, and the High-Pressure Sodium (HPS) type of HID bulb can be even more efficient than this. A decent LED grow light will produce around 100 lumens/watt.

However, there are other factors that affect the cost of electricity to growers:

  • What happens immediately before electricity can enter the lamps in a system.
  • What happens to light immediately after it is emitted by the lamps.
  • Cooling


HID lighting systems require ballasts that convert electricity from a typical source (straight from the socket) into a usable form for HID bulbs. Depending on the quality and age of ballasts, the loss of efficiency can be small or large, but it is never insignificant. LED lighting systems can be plugged directly into the socket and won’t suffer the same losses.

Light loss

Most of the light output from LEDs is focussed in one direction, meaning that an LED grow light doesn’t require extra components to focus its light on your plans. HID bulbs require hoods and reflectors to direct the light at your plants, which can reduce efficiency due to ‘trapped light’.

Cooling / Ventilation

Most HID grow light systems require extra cooling and ventilation to remove the excess heat produced by the bulbs from the growing space. Ventilation means additional electricity costs from running fans. LEDs won’t need cooling as most models have built in fans.

Final Thoughts

LED grow lights definitely have an advantage over HID grow lights when it comes to electricity consumption. The running costs and durability of LED systems mean savings in other areas too, not just your electricity bill. Your heating bills will also go down and you won’t have to worry about replacing so may bulbs, either.

Although LEDs cost more than HID grow lights initially, the benefits such as lifespan, durability, energy savings , nd convenience make them a worthwhile investment.

Further reading

Can you grow weed with a blacklight?
Do LED grow lights need a ballast?

James Alexander James Alexander
Hey, I'm James! The founder and head writer here at I started this site to share my passion and knowledge of all things cannabis. I used to work as a budtender in central Amsterdam, and have over 7 years of growing experience.

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3 thoughts on “Do LED Grow Lights Use Less Electricity?”

  1. Consider me a newbie on this. Lately, I’m kinda worried if my grow lights would affect my electrical bill that much. But now, I’ve had a better understanding when it comes to this matter. Thanks for this very informative post!

  2. Thanks a lot to James Alexander for sharing such an informative guide and I have pleased to get this blog page. I am new at this. I love to garden and work in my free time. I have read your valuable page and gotten much information. But I have two questions that which led light will reduce electricity bills between LED and HID? And how many hours to keep lighting on plants in indoor place? Could you please suggest me? Then I will be benefited. I will await your valuable response with great interest.

    I will save your website link and I will share it with my friends. I hope they will be benefited by this informative article.

    • Any LED will be cheaper to run than an HID, it all comes down to your budget, the size of your growing area and to some degree, personal preference. Regarding light times, it depends on what stage of growing you are at, many people do 18 hours of light and 6 hours of darkness for the vegetative state, others do 20 and 4, I do 24 hours of light with an occasional couple hours of dark to let it rest, usually 1-2 hours every seven to ten days. When it’s time to flower you need to put it on a 12 and 12 schedule, a timer is extremely helpful because varying from your schedule can affect your yield.


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