Mars Hydro FC-E6500
#1 in 300 W and upFull review
A water resistant bar light for a 5x5 ft tent of vegetables or fruiting plants, at a low price for its output.
Amazon $409.99$409.99
The Mars Hydro FC-E6500 is the better LED grow light overall, rated 4.6 to 3.3. The Mars Hydro FC-E6500 leads on warranty, value and features. The Mars Hydro FC-E6500 costs $149.96 less ($409.99 vs $559.95).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
HLG 600 Rspec
#15 in 300 W and upFull review
A powerful, US designed panel for a 4x4 ft or larger tent. It costs far more for the same light than the bar lights here.
Amazon $559.95$559.95
Which should you buy?
- Choose the Mars Hydro FC-E6500 for warranty (5-year warranty vs 3-year warranty), value ($0.20 per µmol/s ($409.99, 2,044 µmol/s) vs $0.37 per µmol/s ($559.95, 1,529 µmol/s)) and features (dimmable, controller or app, IP65 or better vs dimmable).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 300 W and up LED grow light; a clear win is highlighted. How we rank explains each one.
| Factor weight | Mars Hydro FC-E6500 | HLG 600 Rspec |
|---|---|---|
| Overall rating | 4.6/5 | 3.3/5 |
| Value 30% | 83 $0.20 per µmol/s ($409.99, 2,044 µmol/s) | 47 $0.37 per µmol/s ($559.95, 1,529 µmol/s) |
| Efficacy 30% | 80 2.8 µmol/J | 60 2.6 µmol/J |
| Features 15% | 100 dimmable, controller or app, IP65 or better | 40 dimmable |
| Warranty 25% | 100 5-year warranty | 50 3-year warranty |
Specifications
| Mars Hydro FC-E6500 | HLG 600 Rspec | |
|---|---|---|
| Light | ||
| Power draw | 730 W | 600 W |
| PPF | 2,044 µmol/s | 1,529 µmol/s |
| Efficacy | 2.8 µmol/J | 2.6 µmol/J |
| Coverage | 5x5 ft | 6x6 ft |
| Spectrum | 660-665 nm red, 2800-3000K and 4800-5000K white | full spectrum white (Samsung LM301H) plus 660 nm deep red |
| Build | ||
| Form | Multi-bar | Panel |
| Dimmable | Yes | Yes |
| Controller or app | Yes | - |
| Water rating | IP65 | - |
| Warranty | 5 years | 3 years |