How to Build an Easy DIY Grow Light for Seedlings

How to Build an Easy DIY Grow Light for Seedlings

Have you ever started your growing season with glee, only to be disappointed by spindly, weak seedlings? Don't give up!  You might be missing one critical factor in your seed-starting process: light.  You can fix that problem by building an easy DIY grow light for seedlings. Simple, affordable parts from your local hardware store will do the trick.

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This article was originally published on Stacie's old blog, The Petite Farmstead and updated to reflect current prices. You can find all of the other posts from that blog here

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Many veggies like tomatoes and peppers need to be planted from seed 6-8 weeks before your average last frost date, putting some folks (like myself) into February and March.  

We only have about 9-10 hours of daylight in February.  Not even close to the 12-14 hours of strong, steady light required by seedlings to get a healthy start.

Here's where our little project comes in.


The Dirt: DIY Grow Light for Seedlings

  • Cost:  About $150 for 1 shelf of lighting; additional lighting can be added later on (see costs & comparisons below)
  • Tools Required:  Rubber mallet (optional for assembling shelves)
  • Difficulty: Easy
  • Estimated Completion Time: about 30 minutes

Materials & Costs: DIY Grow Light for Seedlings

*Prices online as of 3/8/2018

Now, I've included prices from Lowe's since most people are likely to have a store near them. However, you might find lower prices elsewhere as mentioned below.


Total DIY Cost

   *Unit costs as of March 8, 2018. Prices subject to change. Found a better price? Let us know in the comments!

*Unit costs as of March 8, 2018. Prices subject to change. Found a better price? Let us know in the comments!

  • 1 shelf of lighting (6 sq ft): About $148 or $25.04/sq ft
  • 2 shelves of lighting (12 sq ft): $198 or $16.88/sq ft
  • 3 shelves of lighting (18 sq ft): $264 or $15.18/sq ft

Compare to the cost of these commercial setups:

Other ways to make the cost of your DIY Grow Light setup even less:

  • Source shelving and other components on Craigslist.org or at garage sales; or try Freecycle.org.
  • Watch for sales and coupons at Lowe's, Home Depot, or on coupon sites like RetailMeNot.com.
  • Use sites like eBates to get cash back on your purchases. Right now, for example, Lowe's is offering 1% cash back. Plus, get an extra $10 when you sign up with eBates here and spend $25. I use eBates all the time and love it!
  • Try visiting your local plumbing and electric store for deals on lighting and fixtures.  My local Grover Electric and Plumbing Supply had the light fixtures on sale for $10 recently!
  • Save on shipping by signing up for Amazon Prime or using the Store Pickup feature at Lowe's, Home Depot, Sears, or other stores.

Our amazing readers who've tried our shelving tutorial had some really helpful comments on saving money, too. Thanks so much for sharing what you've found!

Les says: 

Stacie, Love your idea. And to those who think it's more costly today than when you posted your price list... Walmart carries an American made florescent light fixture for T8 lamps (Lights of America) for $10.97 (not on sale). As for the shelving, Walmart has a 48"W x 24"D x 72"H 5-shelf rack for $55.97, steel construction with particle board shelves. A great cost-effective way to get a jump on the gardening season, or possibly do some vertical farming indoors. Thanks for the post!

(Author's note: Walmart sometimes offers 10% cash back on eBates, too!)

Samantha says:

"I did find that looking outside of Home Depot / Lowes sometimes offered the best prices on lighting. For example I got 6 shop light fixtures for only $10.97 each at Menards, with shipping it came out to $16-ish per fixture. I found out that Lighting Supply offers ridiculously low prices on florescent bulbs and they don't force you to buy a whole case of them. For example I bought 8 warm and 8 cool bulbs from them and with shipping it came out to $4.40 a bulb, still the best deal around that I saw! Here is one of the bulbs I bought."

Building your DIY Grow Light Setup

Step 1: Assemble & Install Your Shelf

Assemble your metal shelf, or if you already have one, install it where you want to grow your seedlings.  My shelf is in daylight basement next to a south-facing window.  Save the cardboard from the shelving box.  Use it to line the shelves (to keep water from dripping on the shelf below).


Step 2: Assemble & Hang the Lights

Insert one cool bulb and one warm bulb in each fixture.  Hang the lights along the length of one of the shelves, parallel to one another.  Make sure the bulbs alternate warm-cool-warm-cool.

 Use the S-hooks to attach the chains to the shelf above.  Adjust the chains so they are 1-2 inches above your plants.  


Step 3: Program Your Timer

Program your timer according to its instructions.  The lights should be on for about 14 hours per day.  I have mine set to keep the lights on from 6 AM to 8 PM, 7 days a week.  


Step 4: Plug In the Lights

Plug your lights into the surge protector.  Plug the surge protector into the timer.  Plug the timer into your extension cord/wall outlet.  


Step 5: Watch Your Seedlings Thrive!

This is the fun part!  You'll notice that your seedlings will no longer be spindly and weak, but stout and strong.  

Lettuce seedlings planted in a repurposed clamshell are strong and healthy about a month after being planted.
Lettuce seedlings planted in a repurposed clamshell are strong and healthy about a month after being planted.
DIY Grow Light for Seedlings-Cabbage and onion seedlings happily basking under the glow of our DIY grow light
DIY Grow Light for Seedlings-Cabbage and onion seedlings happily basking under the glow of our DIY grow light

 I've since added another shelf of lights.  The other shelves are perfect for storage for my seed potatoes, watering can, and other plants awaiting warmer weather.

Here's my station about a month after construction.  I've added another shelf of lights, and remaining shelves house seed potatoes and other plants.
Here's my station about a month after construction. I've added another shelf of lights, and remaining shelves house seed potatoes and other plants.

What do you think?

How do you start your seeds indoors?  Do you have a grow light for your seedlings?  

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