Stick with HPS? I think that's a risk you can't afford in 2025.
I've been managing procurement for a mid-sized hydroponic farm for about six years now. We're not a massive operation, but we go through enough equipment that small differences in pricing add up super fast. For a long time, HPS was the default. It worked. It was 'proven.' And honestly, the upfront cost of LED seemed—okay, seemed—absurd.
But here's what I've learned: The industry has evolved way more than most operators want to admit. What was best practice in 2020 with HPS is now a liability in 2025 if you're serious about margins.
My core argument is simple: The 'cheaper' HPS setup has a higher total cost of ownership (TCO) than a quality LED system from a brand like Mars-Hydro, once you account for everything.
Let me walk you through the numbers I've tracked, not the marketing hype.
Argument 1: The 'cheaper' upfront cost is a trap
I assumed for the first two years that HPS was cheaper. I mean, a 1000W HPS kit costs maybe $150-200. A comparable LED from Mars-Hydro, like the TS3000, is easily double that. So I signed off on HPS. Didn't verify the full picture. Turned out I was missing a ton of hidden costs.
Here’s what I found when I audited our 2023 spending:
- Bulb replacement: HPS bulbs need replacing every 10,000-12,000 hours. That's about every 14 months for us. A single 1000W bulb is $30-50. We have 40 fixtures. That’s $1,200 - $2,000 annually just on bulbs. LEDs like the TS3000 are rated for 50,000+ hours. Serious savings.
- Cooling: HPS runs seriously hot. We needed extra exhaust fans and AC in our grow room. That was a $4,500 capital cost we didn't budget for, plus an extra $150/month in electricity just for cooling.
- Ballasts: Magnetic ballasts fail. We replaced 6 in two years at $80 each. That's $240, plus labor. Mars-Hydro's drivers are built into the fixture and are more reliable (and they sell replacement drivers if one does fail).
So that 'cheap' $150 HPS fixture? My TCO over 3 years was probably closer to $400. The $300 Mars-Hydro TS3000? Probably around $330, mostly just the purchase price. The difference was way bigger than I expected.
Argument 2: The 'energy savings' is real, but it's not just the wattage
Everyone talks about LED being more efficient. And it is. A 300W LED from Mars-Hydro replaces a 600W HPS easily. That's a 50% reduction in direct power consumption.
But the bigger win for us was indirect. Because LEDs produce way less heat, we turned off one of our two AC units in the summer. That saved us roughly $300/month during June, July, and August. Plus, we didn't have to run our exhaust fans at max speed, which saved another bit on electricity. It's not huge on paper, but over a year, that's another $900-1,200 in electricity savings alone. (Source: Our internal energy audit, Q2 2024).
Plus, 'full spectrum' LEDs from a company like Mars-Hydro aren't just marketing fluff. They give plants the specific wavelengths they need. We saw a 15% improvement in lettuce yield in Q3 2024 compared to the same space under HPS. That's more harvestable crop from the same electricity. That's a double win.
Argument 3: Smart controls change the game
This is the one that surprised me most. We didn't have a formal process for dimming our lights manually. Cost us when we realized we had some on at 100% during a low-light phase, wasting electricity.
Mars-Hydro's Iconnect smart controller is a huge deal for a procurement guy like me. We set schedules, dim lights, and monitor power draw from a single dashboard. No more standing there with a screwdriver. We used it to dial in a 'sunrise/sunset' effect and shaved 2 hours of run time per day off each light cycle. That's a 20% reduction in running time, which directly translates to a 20% reduction in electricity costs for that period.
I built a cost calculator after getting burned on manual dimming. The smarter your control, the better your ROI. Seriously, the controller paid for itself in about 4 months.
But won't HPS be better for my winter heating?
I get this question every time. Some growers argue HPS heat is 'free' in winter. It's a fair point. But it's also not free—it's inefficient. That heat is a byproduct of wasted energy. You're paying to create heat you might need for temperature, but you're paying for it at a 1:1 electricity-to-heat rate. A modern greenhouse uses a heat pump or gas heater for 3-4x the efficiency.
Plus, with a quality LED and a good smart controller, you can run the lights during the coldest part of the day and off during the warmest, which mimics nature better anyway. It's not a disadvantage if you plan for it.
Bottom line
The cost of lighting isn't about the sticker price on a fixture. It's about the total cost of operation over 3-5 years. In my experience, the industry has evolved, and LEDs from reliable brands like Mars-Hydro are now the more cost-effective choice for commercial growers. The upfront price is higher, but the savings on electricity, cooling, bulb replacement, and controls make it a no-brainer.
Don't get caught in the sunk-cost fallacy of HPS. The numbers don't lie. I've tracked them for 6 years, and the tipping point has come.