If you're reading this, you're probably in the middle of spec'ing out your first LED grow light system—or upgrading from older tech. You've got the budget approved, but now you need to make sure what you order actually works when it arrives.
I manage purchasing for a mid-sized controlled environment operation. In 2023, we did a complete vendor consolidation project—cut from 8 vendors to 3—and converting to LED was a big part of that. We ordered about 120 fixtures across two phases. Some things went great. Some things I'd do differently. Here's the checklist I wish I'd had from day one.
Who This Checklist Is For
This is for facility managers, procurement leads, or ops directors who are buying LED grow lights for the first time in a business context. You're not a hobbyist. You're placing orders that need to hit PPFD targets, integrate with existing infrastructure, and survive a warranty cycle. There are four steps. Do them in order.
Step 1: Map Your PPFD Requirements, Not Just Wattage
This is the one that gets skipped most often in the rush to order. We did it wrong the first time. We looked at wattage and assumed it'd be fine. It was not fine.
Here's what I'd do now:
Get the PPFD map for the fixture you're considering—your supplier should have one. For example, if you're looking at a mars hydro ts1000, they publish a PPFD map for it at various hanging heights. The mars hydro ts1000 ppfd map shows you the coverage pattern. That matters way more than the total wattage.
Take that map and overlay it on your actual canopy layout. You need to know if the light distribution matches your bench or rack dimensions. Our canopy is 4x4 sections, so we needed a fixture with good uniformity across that footprint. The mars hydro ts 1000 ppfd chart confirmed it hit ~700 µmol/m²/s at 18", which was about right for our veg phase.
Don't just check the center reading. Check the edges. The drop-off from center to corner on the TS1000 was about 30%, which was fine for us—good enough that we didn't get patchy growth. A fixture with a more focused beam might have left the edges underlit.
Action item: Request the PPFD map for the specific model at the hanging height you plan to use. If the supplier can't provide one, that's a red flag.
Step 2: Check System Compatibility—Controller and Driver
This step is deceptively easy to miss. You buy the fixture, it works, end of story, right? Not always. If you're scaling, you need a system that talks to itself.
We use the Mars Hydro smart controller. It connects over Zigbee and lets you set dimming schedules and sunrise/sunset effects. That's nice—but only if the fixture has a compatible driver. The FC-E4800, for example, comes with a controller port. Some older models or budget lines don't.
The system lighting aspect is the part I underestimated. If you're buying 20+ fixtures, you don't want to manually dim them one by one. Get a controller that can handle the whole array. Verify before you order that the driver is dimmable and speaks the same protocol as your controller (0-10V, PWM, or Zigbee). I had a vendor ship 30 fixtures with non-dimmable drivers once because I didn't specify. That was a fun call with my VP.
Action item: If you're planning to use a controller, get the compatibility list in writing. Specify dimmable drivers on the PO.
Step 3: Plan Your Electrical and Mounting Setup
This step sounds basic, but the details matter. LED fixtures draw less power than HID, so you might have spare capacity on existing circuits. But you need to confirm.
We ran into an issue on Phase 2. The panel led fixtures we ordered had a thicker driver housing than our old lights. They didn't fit the mounting rails we'd installed. We ended up swapping mounts—more cost, more labor. Measure the dimensions of the fixture, including the driver. Get the manufacturer's weight spec. Our ceiling grid was rated for 30 lbs per point; the TS1000 was 7.5 lbs, so no issue there. But the FC-E4800 was heavier. Check your structure.
For wiring: most LED fixtures have a standard plug, but some need hardwiring. We had an electrician do a quick walkthrough. He pointed out that our daisy-chain plan for the fixtures needed a specific gauge wire—not a huge deal, but it meant a trip to the supply house mid-install.
And here's a small thing: what to do with leftover led strip when you're installing linear lights? We had a roll of 5m that was cut to fit, with about 1.2m leftover per row. I didn't plan for that. It's wasteful unless you have a use for short segments. If you're ordering custom lengths, get them pre-cut to spec rather than cutting on-site. Saves time and keeps your inventory clean.
Action item: Compare the fixture dimensions and mounting type to your existing hardware before the order ships. Get an electrician estimate included in the project budget.
Step 4: Run a 48-Hour Burn-In Test
This is the step I almost skipped on Phase 1, and I'm glad we didn't. Once you receive the fixtures, don't just install them. Test them first.
Set up a sample—one fixture from the batch—on a test bench. Run it at full power for 48 hours. Check for flicker, audible hum, or heat buildup in the driver. We found that one of our fixtures had a loose connection to the sensor port—the PPFD reading would drop to zero intermittently. If that had been hung 10 feet up, it would've been a pain to diagnose and fix.
We also used a PAR meter (rented, not bought—about $50 for a week) to spot-check the PPFD output against the published mars hydro ts1000 ppfd map. It was within spec—within about 5% at 18", which was fine.
The burn-in also catches dead-on-arrival units. We had 2 out of 120 in Phase 1 that failed within 24 hours. Replacement was handled under warranty, but if they'd been installed, the labor to swap them would've been significant.
Action item: Build a test period into your installation timeline. If possible, power on all units for a full day before mounting.
A Few Things I Learned the Hard Way
- Check spare part availability ahead of time. The replacement driver for our fixtures wasn't in stock domestically. We ordered one as a spare, just in case, but it took 6 weeks. If a driver fails mid-cycle, that's a problem. Ask about lead times for common replacement parts like drivers, sensors, and power cords.
- Don't assume the included power cord is long enough. Our lights came with 5-foot cords. Our ceiling mounts were 8 feet from the nearest outlet. We had to add power strips, which was ugly. A 10-pack of extension cords solved it, but it added $40 to the project cost that I hadn't budgeted.
- The spec sheet is an approximation. Real-world PPFD varies with temperature, age of the diodes, and cleanliness of the lens. The mars hydro ts1000 ppfd chart is a good reference, but we found it was measured at a specific temperature. Our ambient temp was a bit higher, so we saw about 3-5% less output. Not a deal breaker, but good to know.
Pricing as of early 2025: The TS1000 was about $80-100 per fixture (verify current pricing at mars-hydro.com). The smart controller was $35. Budget about $15-25 per fixture for mounting hardware and wiring adjustments. Not huge money, but it adds up over 50 units.
Take it from someone who ordered first and asked questions second: go through this list before you place the PO. Your ops team—and your budget—will thank you.
(I should mention: I'm not an electrician or a grow scientist. I'm a buyer who's been bit by the details. If I can save you one headache, that's enough.)