Treegers 420W GL420W LED (Suits 1.2x1.2m2)

What is the Treegers 420W GL420W LED and what grow area does it cover?

The Treegers 420W GL420W is a 6-bar, full-spectrum LED grow light designed for up to 1.2m x 1.2m (4x4ft) coverage. It’s commonly run in tighter 1.0m x 1.0m setups for higher intensity and suits tents, grow rooms, or vertical rack systems.

Is the Treegers 420W GL420W LED suitable for all grow stages?

Yes—its “Full-Spectrum Fusion” design supports full-cycle growing, including propagation, veg, and flowering. Just adjust dimming and height as plants grow.

How much light does it produce and how efficient is it?

It outputs 1155 μmol/s with an efficiency of 2.8 μmol/J, drawing 420W. That means strong performance with lower power use than older lighting tech.

Does the Treegers 420W GL420W LED support dimming?

Yes—it supports 0–100% dimming in 10% steps via a compatible 0–10V controller like the Treegers Precise T Dimmer. It can also be grouped with other fixtures for synced dimming control.

What dimming levels should I use for seedlings, veg, and flower?

Start seedlings at 10–30%, increase to 40–70% in veg, and 70–100% for flower (if your environment can handle it). Always observe plant response and adjust accordingly.

How high should I hang the Treegers 420W GL420W LED?

Start higher and lower it gradually while monitoring plant health. Too much intensity too close can cause bleaching, curling, or tacoing. A PAR meter helps fine-tune placement.

Does the Treegers 420W GL420W LED run hot?

It runs cooler than HID but still produces heat—good airflow and extraction are needed. It uses passive cooling (no fan), so it’s quiet and has fewer moving parts to fail.

Is the Treegers 420W GL420W LED waterproof or easy to clean?

It’s IP66 rated—resistant to dust and strong water jets—but don’t spray it directly. To clean, unplug it, let it cool, and wipe with a damp microfiber cloth.

What are the size and weight of the Treegers 420W GL420W LED?

The fixture measures approximately 680 x 700 x 42 mm and weighs about 5.08 kg. Most tent frames can support it—just use strong ratchets and avoid weak crossbars.

What’s included with the Treegers 420W GL420W LED?

Included: the 6-bar LED fixture with integrated driver, power cable, stainless cable hangers, and a user guide. Just add a compatible dimmer if needed.

What voltage does it run on and is it efficient?

The GL420W supports 120–277V input with a power factor over 0.95, making it compatible with most setups and efficient for long-term use.

How long does it last and what’s the warranty?

LED bars are rated for 60,000+ hours under typical conditions. The fixture comes with a 3-year warranty—check retailer terms for details.

Do I need CO₂ or special glasses with this light?

CO₂ isn’t required but can help if you're pushing high light levels in a controlled environment. LED grow glasses are strongly recommended for eye comfort and accurate plant inspection.

Why are my plants bleaching or curling under this light?

It’s likely light stress—common when intensity is too high or the fixture is too close. Raise the light, dim it down, and improve airflow across the canopy to reduce stress.