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Grow a Good Life

journey to a self sufficient life

in Gardening· Spring Gardening

Build a Grow Light System for Starting Seeds Indoors

This post may contain affiliate links, which means that I may receive a commission if you make a purchase using these links. As an Amazon Associate I earn from qualifying purchases.
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Do you want to start garden seedlings indoors? In order to grow healthy seedlings and plants indoors, you will need some supplemental light. Here is a simple and affordable grow light system made from easy to find equipment.

lettuce seedlings growing under lights

Growing plants indoors is an enjoyable project for any gardener. Whether you want to grow herbs inside, start your garden seedlings, cultivate an indoor vegetable garden, or provide supplemental light to your houseplants during winter, this inexpensive DIY grow light shelf will help you raise healthy plants.

Benefits of Growing Your Own Plant Seedlings

Growing your own garden seedlings offers a number of benefits:

  1. It is less expensive than purchasing nursery transplants.
  2. There is a greater selection of seeds available in comparison to the standard plant varieties at most nurseries.
  3. You have full control over the quality of the plants. When you grow your own transplants, you know that they are well cared for and raised without unwanted chemicals.
  4. It provides a little gardening therapy during the winter months when the ground is under a layer of snow.

In order to grow healthy seedlings and plants indoors, you will need some supplemental light. When I first searched online for growing units for starting seeds indoors, I quickly discovered that they cost way more than I wanted to spend. A two-shelf unit with 4-foot fluorescent lights was well over $400. If you have the money to splurge on a grow light system, this 3-Tier Garden Grow Light Kit from Gardener Supply is a dream.

I could not afford such a unit, so this required some creative thinking to figure out a less-expensive option for starting seeds indoors. After shopping around, this is the DIY grow light shelving system I assembled. I have used it for over 10 years!

Equipment for a Building a Grow Light Shelf

You can assemble your own inexpensive grow light system that will serve well for starting seeds indoors and growing an indoor garden. Here is what you will need:

Wire Shelving

image of a black wire shelving unit

I looked for a large wire-shelving unit that would accommodate 4-foot shop lights. I wasn’t able to find a large shelving unit locally, but I did find some 23-inch 3-tier shelving units. Two of these units placed side by side are the perfect size to hang two 4-foot shop lights across each shelf. The shelves are 13-inches deep and two standard seedling trays fit perfectly on each shelf. Plus there is room for two shop lights on each shelf if more light is needed.

These 3-Tier Shelving Units can be found in big box stores or online. Be sure to select units that measure around 30 inches H x 23 inches W x 13 inches D.

If you want a larger grow light shelf, this 6-Tier Shelving Unit will more than double your growing space.

Lighting Fixtures

image of a shop light fixtureShop Lights: The lights I use are your standard 4-foot shop light fixtures found in big box stores or online for around $30. These come with chains and a couple s-hooks. You will need to pick up extra s-hooks to hook the chain to the wire shelving.

Bulbs: Florescent bulbs come in cool, warm, or full-spectrum. Full-spectrum bulbs provide a balance of cool and warm lighting that represents natural lighting. Cool white bulbs provide blue/green spectrum while warm white bulbs provide red/orange spectrum. Full-spectrum bulbs were more difficult to find locally so I use the standard cool white bulbs. Most seedlings and greens do well with cool white bulbs. You can also mix and match a cool and warm bulb for a wider spectrum artificial light Just be sure to rotate your trays every few days so your plants receive the benefits of both as they grow. Check the packaging of your lights to be sure you are buying the correct bulbs to fit your light fixture.

LED Grow Lights: Also consider the new LED grow lights, which offer full spectrum lighting ideal for growing seedlings and plants indoors. The pricing on LED lights has come down significantly over the years. Be sure to select the correct sizes for your shelving unit.

Power Strip with Timer

Seedlings require at least 12-16 hours of light each day. I set my power strip timer for 16 hours on, then 8 hours off. The power strip with a timer is also commonly available in big box stores or online.

Plastic Gardening Trays

image of a stack of black plastic gardening trays

You will need trays or containers to help prevent water from dripping. These black growing trays measure about 20 x 10 inches and one tray fits perfectly on each shelf. These trays are perfect for seed starting using cell packs or recycled containers. I like to double them up for a more secure tray that can be moved around without flexing. You can also use recycled produce trays or small plastic storage totes.

How to Setup Your Indoor Grow Light System:

This DIY indoor grow light system is a simple and affordable setup that is perfect for starting seeds for your vegetable garden, growing vegetables indoors, and providing light for your indoor herb garden. Here is how to put together a grow light shelf using easy to find items:

Step 1: Gather your Components

  • 2 3-tier shelving units
  • 2 4-foot shop lights plus bulbs if needed
  • extra S-hooks
  • power strip with a timer
  • 4 Plant growing trays

Step 2: Assemble the Shelving Units

Follow the instruction that came with your shelving unit and put them together. Since the shelves are adjustable, make sure they are at the same level for both units, and you have plenty of space for the plants and the light fixtures.

Step 3: Setup the Growing Area

Locate the shelves near an outlet. Try to select a place away from heavy traffic, pets, cold drafts, and excess heat. Place the shelving units side by side. I situated the shelves on a little used workbench, but they could also be raised up on a folding table to make it easy to tend to the seedlings.

Hang your lights from the top and middle shelves using the chains and s-hooks. Plug the lights into the power strip timer and plug the timer into the outlet.

Place your plastic gardening trays on the shelves, set your timer, and start growing seedling, herbs, and edibles indoors. Keep the lights about 2-inches above the plants and adjust the level as the plants grow.

grow light shelf filled with plants

Step 4: Grow Something

Here are gardening and growing tips to get you started:

  • 10 Steps to Starting Seedlings Indoors
  • Using Soil Blocks for Growing Seedlings
  • 7 Herbs to Start from Seed
  • How to Make a Seed Starting Schedule
  • 10 Reasons to Grow Your Own Organic Food

—

I hope I have encouraged you to put together your own inexpensive grow light system that will serve well for starting seeds indoors. It is also fun to experiment with growing edibles indoors during the winter months. Check out the following articles for indoor gardening:

  • How to Grow an Indoor Vegetable Garden
  • How to Grow Microgreens Indoors
  • 5 Herbs that Thrive Inside

Good planning is key to a successful vegetable garden

Whether you are new to growing your own food or have been growing a vegetable garden for years, you will benefit from some planning each year. You will find everything you need to organize and plan your vegetable garden in my PDF eBook, Grow a Good Life Guide to Planning Your Vegetable Garden.

Grow a Good Life Guide to Planning Your Vegetable Garden

photo of a diy grow light shelving unit with plants

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Filed Under: Gardening, Spring Gardening Tagged With: starting seeds

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Reader Interactions

Comments

  1. Mary Pat says

    February 21, 2018 at 8:08 pm

    How many watts are needed for the fluorescent tubes?

    Reply
    • ©Rachel Arsenault says

      February 24, 2018 at 8:51 am

      Mine are 40 watts.

      Reply
      • Brenda D. says

        March 24, 2018 at 10:55 pm

        I use to have a tanning salon and have extra bulbs. I have been using them as grow lights and they at working fine. Is this ok?

        Reply
        • ©Rachel Arsenault says

          March 26, 2018 at 8:00 am

          If they are working, than sure, it’ ok.

          Reply
  2. Ellen says

    February 13, 2018 at 9:05 pm

    Do you have any idea the ‘cost increase’ in electricity to run these lights for 16 hours? Thanks for any help.

    Reply
    • ©Rachel Arsenault says

      February 13, 2018 at 11:18 pm

      Ellen, Sorry, no I do not. However, I am sure the cost of the electricity for the lights outweighs the cost of purchasing organic produce in the grocery store.

      Reply
  3. Beth says

    February 6, 2018 at 11:46 am

    I would love to be able to print a copy of this article so I can have the instructions at hand to build one of these. It seems all methods of printing the info is disabled on this website. What a shame. I was going to subscribe but it will be an exercise if frustration if I can’t print ideas for my gardening notebook.

    Reply
    • ©Rachel Arsenault says

      February 6, 2018 at 2:06 pm

      Beth, All you have to do is hit print on your browser and you can print the page. No special print button is needed.

      Reply
  4. Amanda says

    January 26, 2018 at 3:42 pm

    I love this idea! I am wondering what the effect to my electric bill would be. Did you notice a jump in your electric bill from having these lights on most of the day?

    Reply
    • ©Rachel Arsenault says

      January 26, 2018 at 6:26 pm

      Amanda, I do not notice a large spike in my electric bill when using these. In any case, the cost of growing seedlings instead of purchasing transplants will balance that out.

      Reply
  5. Lee.landers says

    January 24, 2018 at 11:17 am

    Great site. Can this grow system be set up in a basement with little natural light?

    Reply
    • ©Rachel Arsenault says

      January 25, 2018 at 10:24 am

      Lee, You will need more than just natural light to grow healthy plants.

      Reply
  6. cheryl says

    September 19, 2017 at 7:31 pm

    Hi, Cool site. Thanks. What kind of soil do you need to use?

    Reply
    • ©Rachel Arsenault says

      September 19, 2017 at 9:53 pm

      It depends on what you are growing. If you are starting seeds, use seedling mix as explained in step 3 of this article: https://growagoodlife.com/starting-seedlings-indoors/

      If you are growing edibles, an all purpose potting mix will be fine: https://growagoodlife.com/indoor-garden/

      Reply
  7. Joy King says

    December 25, 2016 at 9:17 am

    Hello,

    I saw your comment that this set-up will work for other edibles grown indoors, I’m curious about lettuces though. As a more cooler-weather plant, would you lessen the time needed for the lights to be on?

    Thank you. Really enjoy your articles. Merry Christmas!

    Reply
    • ©Rachel Arsenault says

      December 26, 2016 at 3:04 pm

      Joy, Thank you for your kind words. I grow lettuce indoors all winter and stick to the 16 hours on and 8 hours off lighting schedule without any problems. The florescent lights are not as strong as real sunlight and I believe the lettuce grows better with the longer lighting period. Lettuce also grows best in a cool location and will bolt or go to seed if your room is very warm.

      Reply
  8. Eric says

    December 23, 2016 at 10:31 pm

    Do you always keep that two-inch distance between the plants and the lights as they grow?

    Reply
    • ©Rachel Arsenault says

      December 24, 2016 at 8:46 am

      Eric, Yes, I try to keep the lights about 2-inches above the plants so they receive the maximum amount of light without touching the bulbs. I adjust the height with chains on s-hooks.

      Reply
  9. Amy says

    November 30, 2016 at 1:13 pm

    I wanted to say thank you! I built this last spring and grew perennials, annuals and all kinds of vegetables from seeds. I used regular shop lights with full spectrum bulbs (not grow lights) and it worked fine. I had it set up on a timer to go on and off. I am going to go bigger this year as I need more room for all the things I want to start from seed.

    Reply
    • ©Rachel Arsenault says

      November 30, 2016 at 6:05 pm

      Amy, I am so happy that this was helpful for you. 🙂

      Reply
  10. Marsha Kay says

    August 5, 2016 at 5:44 pm

    Wonderful ideas here! I’m glad I found this website. I assumed I would have to buy “grow” lights but you are stating regular shop lights work fine, What exactly is the difference (besides price) between “grow” lights and shop lights? Again, thank you for a very informative site.

    Reply
    • ©Rachel Arsenault says

      August 7, 2016 at 7:57 am

      Marsha, I haven’t spent the money on grow lights so I can’t provide you a true comparison. Most grow lights claim to be more powerful and have a higher spectrum and wattage to provide the plants with more light. I do know from years of experience, that shop lights work fine to grow seedlings or other edibles indoors.

      Reply
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