Quick Answer

6-bar full spectrum LED grow light, 645W draw, 2,226 diodes across a 120-degree lens angle.
Built with horticultural white diodes and Osram red diodes, tested in commercial cultivation facilities for over 3 years before release.
Manual and auto dimming across 40%, 50%, 60%, 80% and 100% steps, or full EXT/OFF control, without shifting spectrum quality.
Ships plug and play with an Australian supply cord, ETL listed, mounts to Unistrut.
1244mm long, 1100mm wide, 65mm tall, 14kg. 5-year warranty.
Suits a 4x4 to 5x5ft footprint depending on target PPFD and mounting height.

The 645 Pro is Luxx Lighting's flagship fixture, built around the same design, test and repeat philosophy that runs through their whole range. Rather than picking diodes off a spec sheet, Luxx spent over three years running SMD chips and drivers from different manufacturers through controlled test applications and real cultivation facilities before settling on the combination used here.

The Components

The 645 Pro combines horticultural white diodes with Osram red diodes across a 6-bar design, totalling 2,226 diodes at a 120-degree lens angle. Osram and the horticultural diode manufacturers behind the whites are both genuine leaders in LED R&D, which is where the fixture's efficiency and reliability numbers actually come from rather than marketing copy. The result is a full spectrum output built for real canopy penetration and even coverage, not just a high headline PPFD number.

Dimming Without Losing Spectrum Quality

The 645 Pro runs both manual and auto power adjustment, with fixed steps at 40%, 50%, 60%, 80% and 100%, plus an EXT/OFF setting for external control. Critically, this doesn't shift the spectrum ratio as it dims, which is a common weak point in cheaper dimmable fixtures. That means you can run the same fixture at a lower intensity for propagation or early veg and scale it up through flower without the light quality changing underneath you.

Power and Build

Input power is rated at 645W with a minimum power factor above 0.95, and total harmonic distortion under 10%, both solid numbers that point to a clean, efficient power draw rather than a fixture that's rough on your circuit. The driver runs on passive thermal management, no fan, one less moving part to fail over the life of the unit. Rated mains voltage is 100 to 240VAC across a 100 to 277V operating range at 50/60Hz, and current draw scales down as voltage goes up: 6.1A at 120V, 3.1A at 208V, 2.69A at 240V, and 2.33A at 277V.

The fixture is genuinely plug and play, arriving with an Australian supply cord fitted and ready to run straight out of the box. It's ETL listed and mounts directly to Unistrut, and the all-in-one design means there's no separate driver box to mount or wire in separately. At 1244mm long, 1100mm wide, 65mm tall and 14kg, it folds down for shipping and opens out to its full 6-bar footprint on setup.

Suitable For

Full cycle use from vegetative growth through flower, in tents from roughly 4x4 to 5x5ft. The dimming range also makes it workable for propagation and early veg at reduced output without needing a second, smaller fixture.

Frequently Asked Questions

Does dimming the 645 Pro change the light spectrum?

No. The dimming steps (40%, 50%, 60%, 80%, 100%) maintain spectrum quality throughout, unlike cheaper dimmable fixtures that shift colour ratio as they're dimmed down.

What tent size suits the 645W Pro?

Roughly 4x4 to 5x5ft depending on your target PPFD and hanging height. At closer hanging heights it suits the smaller end of that range; raised higher for broader, more even coverage it suits the larger end.