I manage procurement for a mid-size greenhouse operation—about 25,000 square feet of mixed vegetable production and a smaller cannabis R&D bay. In my first year (2017), I made the classic mistake of buying fixtures based on wattage alone. The result? A $4,200 order of lights that were technically bright enough, but spectrally wrong for our crop cycle. They went straight into storage. That’s when I learned that spec sheets lie if you don’t know what to look for.
Since then, I’ve personally tested or overseen the installation of over 150 fixtures from six manufacturers. This article compares two of Gavita’s most popular commercial offerings: the Gavita 1930e LED and the Gavita RS 1900e LED. I’ll also touch on their compatibility with Luxor spotlights and how to build a dimmable LED driver setup—because if you’re in a commercial space, integration matters.
The Comparison Framework: What We’re Actually Comparing
Before I get into the specs, let me clarify why I’m comparing these two fixtures. Both are aimed at commercial horticulture. Both claim high PPFD (Photosynthetic Photon Flux Density) and energy efficiency. But the devil is in the dimming, the spectrum control, and the long-term maintenance cost.
I’ll break this down into four dimensions:
- Spectrum & Light Quality (Photosynthetic Photon Efficacy, or PPE)
- Dimming & Control Integration (Gavita controller vs. Luxor spotlight compatibility)
- Total Cost of Ownership (upfront cost + power + replacement parts)
- Real-World Reliability (what breaks, when, and how much it costs to fix)
I’ll give a clear winner for each dimension and explain why. At the end, I’ll offer scenario-based recommendations—not a blanket “this is better.”
Dimension 1: Spectrum & Light Quality — The 1930e Wins, But Not By Much
The Gavita 1930e LED is marketed as a full-spectrum fixture with a slightly higher PPE rating (3.0 µmol/J, depending on the batch). The RS 1900e LED is also full-spectrum but has a more focused PPE range (2.8–2.9 µmol/J). On paper, the difference is 0.1–0.2 µmol/J. In a 24-fixture setup running 12 hours a day, that difference translates to about 6–8% less power consumption for the same light output.
When I compared the two side by side in our R&D bay—same plants, same height, same photoperiod—I noticed something odd. The 1930e had a slightly warmer hue (more red spectrum), which actually accelerated flowering in our strawberries by about 3 days compared to the RS 1900e. That surprised me. I didn’t expect a 0.1 µmol/J difference to affect phenology.
From the outside, it looks like a minor spec delta. The reality is that the 1930e’s spectrum tilt (more far-red) can trigger specific plant responses. For cannabis, I’ve seen stretch reduction; for leafy greens, the difference was negligible. So for flowering crops, the 1930e has an edge. For vegetative growth, the RS 1900e is just fine.
Conclusion on Spectrum:
Winner for flowering: Gavita 1930e LED.
Winner for general veg: Tie. The RS 1900e is more cost-effective for simple photoperiods.
Dimension 2: Dimming & Control — The RS 1900e Plays Nicer with Luxor Spotlights
This is where things get interesting—and a little frustrating. Both fixtures support 0-10V dimming, but the implementation differs. The Gavita 1930e is designed to work with the Gavita controller ecosystem (which is proprietary). The RS 1900e is slightly more open; it accepts standard 0-10V signals without a proprietary handshake.
Why does this matter? If you’re running a mixed lighting environment (like I do), you might be using Luxor spotlights for accent lighting or supplemental side-lighting. Luxor controllers use a modified 0-10V protocol, and I’ve found that the RS 1900e responds to them more consistently than the 1930e.
“Honestly, I’m not sure why Gavita didn’t standardize the 0-10V protocol across both fixtures. My best guess is that the 1930e’s electronics require a slightly different voltage curve for dimming stability. But for integration, the RS 1900e is the one that works with my Luxor system without extra translators.”
If you plan to build a dimmable LED driver for a custom controller, the RS 1900e is the easier platform. The 1930e has an internal bypass that requires a specific resistor to dim properly. I learned this the hard way: I fried one 1930e LED driver by sending it a too-aggressive pulse-width modulation signal. That was a $200 mistake (replacement driver cost).
Conclusion on Dimming:
Winner for integration: Gavita RS 1900e LED.
Winner for proprietary ecosystems: Gavita 1930e LED (if you’re all-in on Gavita controllers).
Dimension 3: Total Cost of Ownership — The Hidden $850 Difference
At first glance, the 1930e is about $150 more expensive per fixture (MSRP). Over 50 fixtures, that’s $7,500. But that’s not the whole picture.
I keep a detailed spreadsheet on all our equipment. Over 18 months, we tracked:
- Power consumption: 1930e consumed 12% less energy per μmol of light delivered (sample of 6 fixtures each, measured with a kWh meter and a PAR sensor). That saved about $0.85 per fixture per month.
- Driver replacement: We had zero failures on the 1930e. Two RS 1900e drivers failed at month 14 and 17. Replacement cost: $85 each. That’s a 4% failure rate over 18 months—not catastrophic, but annoying.
- Warranty coverage: The 1930e has a 5-year warranty (with terms). The RS 1900e has a 3-year warranty. For a commercial setup, that extra 2 years matters.
Over a 5-year period (before expected LED degradation to 90% of initial output), the 1930e costs about $850 less per 10-fixture zone, despite the higher upfront price. That’s assuming current electricity rates (circa 2025) and no major power price increases.
Note: Pricing is for general reference only. Actual prices vary by vendor and time of order. Power cost calculations assume $0.12 per kWh.
Conclusion on TCO:
Winner: Gavita 1930e LED. The better energy efficiency and longer warranty outweigh the higher upfront cost for a 5-year commercial horizon.
Dimension 4: Real-World Reliability — A Surprising Twist
People assume that the more expensive fixture is the more reliable one. In this case, that’s true for the electronics. But there’s a catch: the physical design of the RS 1900e is actually more robust for dusty environments.
The 1930e has a cooling fin design that traps dust (especially in greenhouses with high humidity and airborne organic matter). The RS 1900e’s cooling system is a little more open, with fewer tight crevices. In our tomato house (where humidity is often 80%), we had to blow out the 1930e’s fins every 2 weeks. The RS 1900e needed it every 4-6 weeks.
From the outside, it looks like the 1930e is more delicate. The reality is that both fixtures handle humidity fine; one just needs more frequent maintenance. If you’re short on labor, the RS 1900e saves you time.
Conclusion on Reliability:
Winner for clean environments: Gavita 1930e LED.
Winner for dusty/humid environments: Gavita RS 1900e LED.
Which One Should You Buy? (Scenario-Based)
Here’s my honest take, based on three common scenarios:
- You’re building a new facility from scratch, with Gavita controls. Get the 1930e. The energy savings and longer warranty pay off in year 3-4. It’s a premium product for a premium setup.
- You’re retrofitting an existing space, or integrating with Luxor spotlights. Go with the RS 1900e. The dimming compatibility is more forgiving, and you won’t need extra adapters.
- You’re on a tight budget but need quality. Buy the RS 1900e for veg, and sprinkle in a few 1930e units for your flowering tent. That’s a mixed strategy that maximizes results without breaking the bank.
Honestly, I’ve never fully understood why Gavita didn’t make the 1930e’s 0-10V input more universal. But that’s the reality of proprietary engineering. If someone has insight into their design philosophy, I’d love to hear it—maybe I’m missing a workaround.
One last thing: if you’re planning to build a dimmable LED driver for a custom controller, start with the RS 1900e. It’s a much easier platform to hack. The 1930e’s internal protection circuit is tricky to bypass safely.
Price and power data based on quotes from three distributors (January 2025); verify current pricing before ordering.