Lumatek 30W UV Supplemental LED Bar - Targeted UVA/UVB for Flowering Crops
Best for: growers running a Lumatek Zeus fixture (or similar full-spectrum LED) who want to add controlled UV supplementation during flowering.
Our thoughts
UV supplementation is one of those things growers argue about endlessly, but the theory behind it (triggering the plant's own UV-stress responses to boost resin and pigment production) is genuine plant science. This bar gives you a controlled, daisy-chainable way to add it, rather than rigging up a reptile bulb and hoping for the best.
The Lumatek 30W UV Supplemental LED Bar is a dedicated UVA/UVB add-on light designed to fit alongside Lumatek's Zeus range of full-spectrum LED fixtures, though it can be run with other lighting setups too. It outputs radiation across the UV-B (280-315nm) and UV-A (315-400nm) bands, the wavelengths associated with triggering plants' natural UV-stress responses, without producing any UV-C, which is harmful rather than beneficial at grow room intensities.
It runs from its own integrated power unit and is daisy-chainable, so multiple bars can be linked and controlled together across a larger canopy rather than wiring each one independently. Because UV output at this intensity is a genuine consideration for eye and skin exposure, it's designed to be run for limited daily periods rather than continuously through the full photoperiod.
How it compares
UV supplementation for grow rooms ranges from dedicated LED bars to repurposed reptile lighting.
- Some growers use cheap reptile UVB bulbs as a budget alternative, but these aren't designed or dosed for plant-safe UV exposure and can be inconsistent between units.
- Full-spectrum LED fixtures with UV built into the diode array are more convenient (no separate bar to mount) but give you no independent control over UV dose relative to the rest of the spectrum.
- Running no UV supplementation at all is the simplest option and plenty of growers do fine without it, but it takes UV entirely off the table as a tool for the later flowering weeks.
For growers who specifically want controllable, purpose-built UV dosing rather than a bundled or improvised source, this is the more precise route.
Usage guidance
UV supplementation needs a lighter touch than main-spectrum lighting.
Mounting
Position alongside your main fixture, ideally a Lumatek Zeus unit given the bar is designed to complement that range, and use the daisy-chain link if running more than one.
Timing
Run for a limited portion of the daily photoperiod during flowering rather than the full light cycle; many growers introduce UV gradually and only in the second half of flower.
Safety
Avoid direct, prolonged eye or skin exposure to the running bar, the same caution you'd apply to any UV-B source.
Technical specifications
- Input power: 30W
- Spectrum: UV-A (315-400nm) and UV-B (280-315nm)
- UV-C output: None
- Connectivity: Daisy-chainable with integrated power unit
- Designed for: Lumatek Zeus fixtures and other full-spectrum LED setups
- Use case: Supplemental UV dosing during flowering
Who this is for
- Lumatek Zeus fixture owners wanting to add controlled UV supplementation
- Growers who want to test UV's effect on resin/pigment production without guessing at dose
- Multi-fixture rooms wanting daisy-chained UV control across the canopy
- Growers currently improvising with unrated reptile UV bulbs who want a purpose-built alternative
Our take
This is a specialist add-on rather than a core light, and it's priced accordingly, so it makes most sense for growers who already have their main spectrum sorted and want to experiment with UV specifically. Pairing it with a Zeus fixture is the cleanest setup.
Proper kit at a price that makes sense for growers ready to add a genuine UV tool to their flowering routine.
