The Day the Power Bill Broke Us
I manage purchasing for a mid-sized commercial greenhouse operation. In 2022, I got a call from our CFO. Our monthly energy bill had jumped 35% in six months. Thirty-five percent. The numbers didn't make sense. We hadn't changed our footprint, our hours, or our crop mix. But sitting there, looking at the spreadsheet, I realized we had a problem that wasn't going to fix itself with better scheduling. It was our lighting.
We were running a mix of 1000-watt HPS fixtures—some of them nearly a decade old. The ballasts were inefficient. The heat load was brutal on our AC system. And the light spectrum? Let's just say we weren't getting the growth we thought we were.
I knew I should have started looking at LEDs years earlier. But I thought, 'we've got a system that works, it's paid for, what are the odds that switching now will save that much?' Well, the odds caught up with me when I saw that energy bill. That was the day I started the conversion to Gavita Pro 1700e LEDs.
I still kick myself for not doing it sooner. If I'd switched in 2020, we'd have saved roughly $28,000 in excess electrical costs. That's a hard number to swallow.
The Three Lessons Nobody Told Me About Conversion
1. It's Not Just About Swapping a Bulb
Here's the thing: converting from HPS to LED is not a straight swap. Anyone who tells you it is has either never done it or got lucky. The first issue was heat management. HPS lights run hot. In the winter, that heat was actually useful for keeping our greenhouse warm. When we switched to Gavita LEDs—which are significantly cooler—we had to rebalance our HVAC system. That's an extra $4,200 I didn't budget for.
Second, power draw isn't linear. We assumed lower wattage = lower operating cost. And it is. But the payback period depends on how many hours you run. I wish I had modeled our specific light cycle before pulling the trigger. What I can say anecdotally is that the Gavita Pro 1700e draws roughly 650W at full power—about 35% less than our old 1000W HPS. But your mileage varies by fixture spacing and hanging height.
Third, installation is not plug-and-play. The Gavita fixtures require wiring. You can't just screw them into an E39 mogul base. If your facility is wired for 120V, the Pro 1700e needs a dedicated circuit. We had to bring in an electrician. That cost, plus the fixtures, meant our initial outlay was higher than I wanted.
2. The Ceiling Height Problem
This one caught me off guard. I didn't think about ceiling height until our head grower pointed it out three days before the installation. The Gavita Pro 1700e is a long fixture—about 46 inches. If your ceiling is low, it changes how you space the lights. We have some benches at 8 feet, others at 10 feet. The 8-foot benches needed the LEDs dimmed to about 50% to avoid light stress on the plants. That means we're not getting the full output we paid for. I don't have hard data on how many growers face this exact problem, but based on conversations at the 2023 Horti Fair, my sense is about 20-30% of commercial retrofits run into this issue. It's not a dealbreaker, but it's a planning detail that can save you headaches if you think about it before you buy.
3. The TrolMaster Adapter is a Game Changer—If You Plan For It
We already had a TrolMaster climate controller. So when I heard about the TrolMaster Gavita LED adapter, I was excited. It lets you dim the Gavita fixtures from the controller. Sounds great, right? It is. But I made a mistake: I ordered the adapters after the lights arrived. I thought we could just plug them in. Wrong. The TrolMaster system needs to be wired to the fixtures, and the firmware on our controller was out of date. We had to update the firmware, re-run the control cables, and test the programming. That delayed our commissioning by two days. Lesson: If you're converting to Gavita LEDs and using TrolMaster, buy the adapters at the same time as the lights. Have your electrician run the control cables during the initial install. It'll save you the cost of an extra service call.
What I'd Do Differently
If I could go back and talk to my 2020 self, I'd tell him three things:
- Invest in the planning phase. I spent maybe 4 hours researching fixtures. I should have spent 40 hours modeling our specific space—heat load, light distribution, power infrastructure. The 12-point checklist I created after this mistake has saved us an estimated $8,000 in potential rework on other projects.
- Write down the intangible benefits. Switching to LED isn't just about wattage. The spectral quality of the Gavita Pro 1700e improved leaf structure and node spacing in our tomato crop. I can't prove that with a spreadsheet, but our head grower noticed the difference within two weeks. Put a dollar value on that.
- Don't assume compatibility. I assumed our standard wiring worked. It didn't. I assumed the TrolMaster integration was seamless. It wasn't. Verify everything before the purchase order. That one extra step can prevent a week of headaches.
Per FTC guidelines on advertising claims (ftc.gov), I have to state that results vary by environment. My results are based on our specific facility. They are not a guarantee.
The Bottom Line
Are Gavita Pro 1700e LEDs worth it? For us, the answer is yes. Our energy costs dropped 28% in the first full billing cycle after conversion. Our crop uniformity improved. And the heat reduction meant our AC system wasn't running constantly through the summer. But the math only works if you plan the conversion correctly. The savings we achieved came from meticulous planning—measuring ceilings, wiring, control systems, and heat management. The ones who fail are the ones who assume it's 'just a light swap.' It's not.
Look, I'm not saying every greenhouse should rush out and buy Gavita LEDs today. I'm saying that if you're paying an energy penalty for old HPS fixtures, and if you have the budget to plan a proper conversion, the Gavita Pro 1700e is a solid choice. Just do your homework first. And start planning your controller integration before the lights arrive. That's a mistake I won't make twice.