The Showdown Nobody Talks About
Walk into any commercial greenhouse right now, and you’ll see the same dilemma playing out. Old-school HPS fixtures humming away, versus newer LED arrays from companies like Gavita. I’m the guy who signs the purchase orders for my facility. When I took over procurement in 2025, I was told to "just buy the cheaper bulbs." That advice didn’t survive the first year of utility bills.
This isn’t a theoretical comparison. I’ve run the numbers on both systems for our 50,000 sq ft facility. The question isn't which one grows plants better—it's which one makes better fiscal sense over three years. Here’s what I found.
Energy Efficiency: The Obvious Winner?
Everyone knows LEDs are more efficient. But the gap is bigger than you think. A typical 1000W Gavita Pro 1700e LED fixture draws about 650W from the wall. An equivalent 1000W double-ended HPS fixture pulls closer to 1050W (ballast loss, folks).
Six months in, the math is brutal.
For our operation running 8 fixtures per room across 4 rooms: the HPS setup cost us about $4,200/month in electricity. The Gavita LED setup? $2,600. That’s $19,200 a year difference. Why does this matter? Because that money isn't just a line item—it's your margin. (Note to self: recalculate these numbers annually as utility rates change.)
"Save 5 minutes on a quote, spend 5 days explaining the CAPEX spike to finance."
Light Spectrum: The Hidden Variable
From the outside, you think light is light. The reality is different. HPS lamps produce a yellow-orange spectrum. That’s fine for flowering, but it’s terrible for the vegetative stage. You end up maintaining a separate inventory of metal halide bulbs for the first 4 weeks. That’s an extra stock-keeping unit (SKU) to manage, order, and store.
Gavita’s Pro series LEDs have a full spectrum. You can run the same fixture from clone to harvest. Look, I’m not a botanist. But from an admin standpoint, fewer SKUs means fewer ordering mistakes. When I consolidated our lighting orders for 400 employees across 3 locations, eliminating the need for two different lamp types cut our supply chain confusion—and my headache—by half.
Real Talk: The Heat Problem
Everything I’d read said HPS systems are cheap. In practice, I found they are cheap only if you ignore the HVAC cost. HPS fixtures produce a ton of heat. In summer, your A/C runs extra. In winter, that heat is useful (sometimes). But the conventional wisdom in my facility was that we could turn down the heating. The reality was, we turned up the cooling in June and July, eating any savings from cheap bulbs.
With the Gavita LED fixtures, we saw a 40% reduction in HVAC load. That’s not a small number. It meant we could either save money or expand grow space without upgrading our chiller. (Which, honestly, was the bigger win.)
Lifespan and Replacement Costs
People assume that because HPS bulbs are cheap ($30-$50), they are economical. What they don’t see is the labor cost of replacement. An HPS lamp lasts 8-12 months. Replacing 32 bulbs twice a year meant I was ordering, storing, and scheduling replacements. The labor cost? About $15 per fixture change-out. That adds up.
A Gavita LED fixture is rated for 50,000+ hours. That’s 5-7 years of 12-hour cycles. No bulb changes. No re-ordering. The upfront cost is 3x higher—I won't put a number on it without a quote (prices change)—but the total cost of ownership? It’s not even close. I’ve come to believe that the 'best' lighting is the one you don't have to touch for five years.
Installation: The Surprise Complexity
Here’s the thing about HPS: it’s easy to install. Plug and play. But the wiring for commercial-grade LEDs like the Gavita 1900e or 1700e is often compatible with 277V or 480V systems. That’s a big deal. If your facility already has higher voltage lighting circuits, you save on copper and conduit. Our electrician told me the 480V Gavitas saved us $1,200 in wiring run costs alone.
The 'Gotcha' Moment
The 12-point checklist I created after my third mistake has saved us an estimated $8,000 in potential rework. One of those checks is confirming voltage compatibility before ordering. During our 2024 vendor consolidation project, I almost bought 120V fixtures because the brochure said 'commercial.' The fine print? You need to specify voltage. I caught it in time, but it was a close call.
Choosing Your Path
So what do you pick? Here's my practical advice, not a marketing spin.
Stick with HPS if:
- You have a small operation (under 1,000 sq ft) and can’t afford the upfront capital expense of LED.
- You need the heat during winter months (and your HVAC system can handle summer).
- Your electrical infrastructure can’t support higher voltage LEDs without a costly upgrade.
Go with Gavita LED if:
- You’re planning to operate for more than 18 months (you’ll recoup the premium).
- You want to eliminate bulb inventory and replacement labor.
- You are building new or retrofitting old wiring (the higher voltage compatibility is a bonus).
- You answer to a finance department that likes predictable expenses.
In the end, the 'cheaper' option isn't always the cheaper option. Prevention (buying the right system once) beats the cure (paying for wasted energy and constant bulb changes) every time.