Fluval Plant 3.0 vs Finnex Stingray 2
Which LED light is best for a planted freshwater aquarium? We compare PAR output, spectrum, programmability, and price to find the winner.
- PAR output~90–120 µmol (24″)
- SpectrumFull programmable RGB
- SchedulingApp-controlled, sunrise/sunset
- Dimming0–100% per channel
- CoverageUp to 36″
- Warranty3 years
- PAR output~50–70 µmol (24″)
- SpectrumWhite + red LEDs
- SchedulingManual timer required
- DimmingNone (on/off only)
- CoverageUp to 30″
- Warranty1 year
PAR Output Comparison
PAR (Photosynthetically Active Radiation) is the measure that actually matters for plant growth. Here’s how these two lights compare at the substrate level of a 12″-deep 20-gallon tank:
PAR values are approximate at substrate level, 12″ depth. Actual readings vary by tank depth and mounting height.
Detailed Comparison
| Category | Fluval Plant 3.0 | Finnex Stingray 2 | Winner |
|---|---|---|---|
| PAR (light intensity) | ~90–120 µmol @ 24″ | ~50–70 µmol @ 24″ | Fluval ✓ |
| Spectrum quality | Full RGB + UV + IR programmable | White + red (fixed) | Fluval ✓ |
| Scheduling / automation | Bluetooth app, sunrise/sunset | Needs external timer | Fluval ✓ |
| Algae control (low light mode) | Dim to any level | On or off only | Fluval ✓ |
| Price | $90–$130 | $45–$70 | Finnex ✓ |
| Ease of use | App setup required | Plug and play | Finnex ✓ |
| Low-light plants | Excellent (dial back intensity) | Good | Tie |
| Medium-light plants | Excellent | Adequate | Fluval ✓ |
| High-light / carpeting plants | Possible (may need CO2) | Not enough PAR | Fluval ✓ |
Spectrum Deep Dive
The Fluval Plant 3.0 uses a 7000K white channel, a 450nm blue channel, a 660nm red channel, and UV/IR emitters — all independently dimmable through the Fluval app. This lets you mimic the golden-hour spectrum of sunrise and sunset, which reduces fish stress and signals natural day/night cycles.
The Finnex Stingray 2 uses a fixed white + 660nm red LED array. The 660nm red is excellent for plant growth (it sits right on the chlorophyll-A absorption peak), but there’s no control over the ratio or intensity. For simple planted tanks this is perfectly fine; for lush, demanding scapes it’s a limitation.
Algae Risk
One of the most common planted tank mistakes is running the light too long or too bright. The Fluval Plant 3.0 wins here because you can dim it down during the algae “danger zone” (the first 8 weeks of a new tank) and then gradually increase intensity as plants establish. With the Finnex, you’re limited to shortening the photoperiod via a timer — effective but less nuanced.
Our Verdict
The Fluval Plant 3.0 is the better light for almost every planted tank scenario. Its programmable spectrum, sunrise/sunset automation, and higher PAR output justify the price premium if you care about plant growth. The Finnex Stingray 2 earns its place as a budget-friendly option for simple, low-light setups or a second tank.
→ See our full Best Aquarium Lights roundup | Planted tank beginner’s guide