Description
A 900W LED Toplight That Swaps In for 1000W HPS
The DLI Zenith 900W FS DC is a full-spectrum LED toplight from Dutch Lighting Innovations, designed as a direct replacement for 1000W HPS fixtures on the same layout. It delivers 2,400 µmol/s at 2.7 µmol/J from 900W through 140° wide-beam optics, and DLI rate the energy saving over the HPS it replaces at up to 25%. The slim 98 x 21 x 13 cm, 12 kg body is built to sit under greenhouse climate screens, carries an IP65 rating and dims from 30% to 100%.
Key Benefits
- 2,400 µmol/s from 900W at 2.7 µmol/J, measured across 400–800 nm
- One-for-one 1000W HPS replacement using up to 25% less energy, by DLI's figures
- 140° wide-beam optics for even light with fewer hotspots and shadows
- Built around cooling – the spacing of the LED bars and venturi-effect fins keep LED temperature down for a longer working life
- OSRAM top-bin LEDs, chosen by DLI for low light degradation over the years
- Dimmable 30–100% to follow natural light levels and crop stage
- IP65, with CE, CSA, DLC and UKCA certification; designed and made in the Netherlands
HPS Heat, Running Costs and Fading Output
A 1000W HPS lamp turns much of its power into heat, and its light output falls away over the life of the lamp, so rooms run hot and light levels drift down between lamp changes. The Zenith keeps the coverage pattern of the HPS it replaces while drawing less power, and its cooling design holds LED temperature low, which DLI link directly to low light degradation and a long service life. The even spread from the wide-beam optics also avoids the bright and shaded patches that lead to uneven growth across a crop.
How to Use
- Replace each 1000W HPS fixture with one Zenith on your existing layout
- In a greenhouse, hang it below the climate screen, where its slim profile blocks less daylight
- Supply: 208–400V, so standard 230V UK mains is within range
- Set output between 30% and 100% with a DLI controller to match natural light and crop stage
Technical Specifications
- Power draw: 900W
- PPF: 2,400 µmol/s (400–800 nm, at 25°C ambient)
- Efficacy: 2.7 µmol/J
- Fixture size: 98 x 21 x 13 cm
- Model: DLI Zenith 900W 208–400V FS DC
- Spectrum: full spectrum
- Beam angle: 140°, wide-beam optics
- Coverage: one-for-one replacement for a 1000W HPS fixture on the same layout
- Voltage: 208–400V
- Dimming: 30–100%
- IP rating: IP65
- Weight: 12 kg
- Certifications: CE, CSA, DLC, UKCA
- Made in: the Netherlands
- Warranty: 5 years
Frequently Asked Questions
Will it replace my 1000W HPS fixtures one for one?
Yes. DLI designed the Zenith 900W FS DC as a replacement for 1000W HPS fixtures in any installation, relying on its light distribution to cover the same layout with up to 25% less energy.
How do I control and dim it?
Output runs from 30% to 100%. For scheduling and dimming across a room, DLI's DLM-4 Zone Controller works with all DLI fixtures and manages up to four independent zones with temperature-based dimming.
Why is the output measured to 800 nm?
DLI measure the 2,400 µmol/s across 400–800 nm at 25°C ambient, so the figure includes light beyond the 400–700 nm PAR band. Compare it with other fixtures measured the same way.
What does FS mean?
Full spectrum – this is the full-spectrum version of the Zenith. DLI also build Zenith spectra with far-red.
Works Well With
