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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. Jennifer says

    February 6, 2021 at 12:04 pm

    It looks like you have 2 shop lights per level so would I need to buy 4 4 ft shop light fixtures and then need 8 bulbs total?

    Reply
    • ©Rachel Arsenault says

      February 9, 2021 at 11:45 am

      Jennifer, Yes, I did eventually purchase additional shop lights and now hang 2 fixtures per shelf.

      Reply
  2. Rex Jones says

    January 26, 2021 at 1:37 am

    looking for the old style florescent fixtures for making grow lighting. don’t want LED. too expensive. any ideas where to find them ?

    Reply
    • ©Rachel Arsenault says

      January 29, 2021 at 11:47 am

      Rex, it is more difficult to find florescent shop lights right now. Check with your local hardware stores, and big box stores such as Home Depot and Lowes.

      Reply
      • Danielle Wingert says

        March 1, 2021 at 11:01 pm

        Hey guys I was able to get LED bulbs for some old shop lights being taken down in our shop from a big box store! It was $20 I believe for the set. It seemed comparable to ones labeled grow light. Hope this helps!

        Reply
        • ©Rachel Arsenault says

          March 2, 2021 at 1:12 pm

          Danielle, That is great news! Thanks for sharing.

          Reply
  3. Michael says

    December 8, 2019 at 5:18 pm

    Hi Rachel, thanks for the how-to. What do the shelving units rest on? I’m looking to set something up in my basement, but I don’t want to put the shelving unit directly on the floor due to all of the basement being carpeted.. Looking to put a short-stack of shelving units on top of a narrow table, but I’m having trouble finding something suitable and not really looking to build something, even something simple. What are you working with in your pictures? Looks like your shelving units are on top of a table.

    Reply
    • ©Rachel Arsenault says

      December 11, 2019 at 10:15 am

      Michael, I placed the shelves on top of a table so the plants were easier to get to without stooping down. A simple 4×4 card table would work and provide a little extra space for working and storing jugs of water.

      Reply
  4. Jay says

    October 12, 2019 at 11:17 am

    Thank you for the great info.
    QQ – have you tried using LED bulbs in your shop lights to save electricity? If so, any recommendations?

    Reply
    • ©Rachel Arsenault says

      October 15, 2019 at 9:01 am

      Jay, No, I have not tried the LED bulbs, so I cannot advise.

      Reply
  5. Maria says

    February 23, 2019 at 7:52 pm

    I have almost this exact set up and I’ve just lost some lovely seedlings because the grow light unit caused the the temperature to get way too high. Does this ever happen to you? Are flourecent better? Are three shop lights per shelf too many?

    Reply
    • ©Rachel Arsenault says

      February 25, 2019 at 10:43 am

      I am sorry you lost your seedlings, Maria. What type of grow lights are you using? The ones I recommend do not get hot enough to kill seedlings.

      Reply
  6. Linden says

    April 3, 2018 at 8:45 pm

    Great to know shop lights will work fine!

    Also, a tip for cheapskates who live in small place with no storage, and only need to start seeds: Adjust the light height by using books/bricks/cans/boards/milk crates. These can be placed under the ends of the lights and/or under your seed/seedling trays, to keep the lights at 3-5″ from the dirt. I put it all on a card table or two for the seed-starting season.

    For the past few years, I moved my fish tank lights start my hot pepper seeds (Zone 3). The fish tank lights were purchased for growing aquarium plants, but they have burned out, too pricey to replace. So, thanks again for letting me know shop lights will work!

    Reply
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