The Pure LED Q240 Grow Light is a 240W full-spectrum LED panel from Pure Factory, built for indoor tents and rooms in the 80×100 cm range. At 45×45 cm and just 4.5 kg, it sits flat against the top of your tent and delivers the kind of even canopy coverage that turns a decent grow into a heavy harvest.
Why the Pure LED Q240 earns its spot in your tent
If you've been running an HPS and your electricity bill is making you reconsider life choices, this is the swap. The Q240 pulls 240W from the wall and turns it into 2.7 μmol per joule of usable light — that's roughly the efficiency sweet spot for hobby-scale LEDs in 2025. You get strong vegetative growth and dense flower sites without the heat dome that HPS dumps onto your canopy.
The board uses 896 Samsung LM281B+ PRO white diodes paired with 48 Honglitronics SMD3535 deep-red 660nm chips. The whites cover the 4000K spectrum your plants chew through during veg, while the reds push flower bulk during bloom. No spectrum switches, no veg/bloom toggle — it's a single full-spectrum recipe that works through the whole cycle.
One honest limitation: the 45×45 cm form factor is sized for tents up to 100×100 cm. Try to stretch it over a 120×120 and you'll get hot spots in the centre and weak corners. If you're running a bigger tent, look at a 480W board or two of these in parallel.
Specs at a glance
| Size | 450 × 450 × 43 mm |
| Weight | 4.5 kg |
| Input voltage | 100–277V AC |
| Power consumption | 240W |
| Power factor | >0.90 |
| Efficiency | 2.7 μmol/J |
| LED diodes | Samsung LM281B+ PRO (896) + Honglitronics SMD3535 660nm (48) |
| Spectrum | Full — 4000K white + 660nm red |
| Beam angle | 120° |
| Dimming | Manual + 0–10V controller compatible |
| IP rating | IP65 (humidity protected) |
| Operating temperature | -25°C to 35°C |
Best tent size for the Q240
The Q240 hits its stride in tents between 80×80 cm and 100×100 cm. That's the coverage area where you get full PPFD penetration to the corners without the centre being overcooked. We'd pick this over a generic 200W quantum board for an 80×80 every time — the Samsung diodes alone justify the price gap.
| Tent size | Q240 fit |
|---|---|
| 60×60 cm | Overkill — dim it to 70% or step down to a 150W board |
| 80×80 cm | Sweet spot — full power, full canopy |
| 100×100 cm | Good fit — keep it 35–45 cm from canopy in flower |
| 120×120 cm | Underpowered — go for a 480W board or run two Q240s |
How the dimming and control work
The Q240 has a manual dimming knob on the driver — handy for clones and seedlings where 240W full blast would just bleach them. Start at 30–40% for the first week, work up to 70% through veg, then push to 100% in mid-bloom when your plants can actually handle it.
It's also compatible with any 0–10V signal controller. If you're already running a Trolmaster, Niwa, or generic master controller, plug it in and let the controller ramp it up and down with your light schedule. This is the feature that separates hobby kit from properly scalable gear.
How to set it up
- Hang the lamp from the top bars of your tent using the included rope ratchets — set the initial height at 50–60 cm above the canopy.
- Plug into a standard 230V socket (it accepts 100–277V AC, so it's fine across the EU).
- Set the dimmer to 30–40% for seedlings and clones during the first 7–10 days.
- Increase to 60–70% through vegetative growth — drop the lamp to around 40 cm above canopy.
- Run 100% during mid-flower, lowering to 30–35 cm above canopy if your plants can handle it (check leaves daily for bleaching).
- If using a 0–10V controller, wire it to the driver port and set your sunrise/sunset ramps for smoother transitions.
Pairs well with a Secret Jardin DR80 tent, an AC Infinity carbon filter and inline fan combo for proper extraction, and a Pure Factory 0–10V controller if you want full automation. A decent quantum-board PAR meter is also worth the spend — guessing canopy intensity is how people bleach perfectly good plants.
What makes it different from other 240W boards
Most 240W LEDs in this price bracket use generic Bridgelux or no-name diodes. The Q240 runs Samsung LM281B+ PRO chips — the same diode family used in boards costing twice as much. The 48 deep-red 660nm chips from Honglitronics aren't filler either; they're specifically there to boost flower density during bloom, which is where cheaper full-spectrum boards fall flat.
The IP65 rating is also worth flagging. Most LED boards in this class are IP54 at best, meaning they'll tolerate high humidity but won't survive a sprayer mishap. IP65 means dust-tight and protected against water jets — useful when you're foliar feeding or running a high-RH bloom room.
Frequently Asked Questions
How far should I hang the Q240 above my plants?
Start at 50–60 cm above canopy for seedlings, drop to 40 cm during veg, and 30–35 cm during flower. If you see leaf bleaching or taco-ing, raise it 5 cm and dim to 80%.
Does the Q240 replace a 400W HPS?
Yes, comfortably — and with about 40% less heat output. The 2.7 μmol/J efficiency means the 240W draw delivers similar usable light to a 400W HPS while running cooler and cheaper.
Will it fit a 60×60 cm tent?
It will physically fit, but it's overkill at full power. Dim it to 60–70% or you'll bleach your canopy. For a 60×60 we'd suggest a 150W board instead — better fit, less waste.
Can I daisy-chain two Q240s for a bigger tent?
Yes. Both can be wired to a single 0–10V controller for synchronised dimming, which is the cleanest way to cover a 120×120 or 150×150 tent. Each lamp still needs its own mains plug.
Is it noisy?
Barely audible. The driver runs passive-cooled with a small low-RPM fan on the heatsink — quieter than your extraction fan by a long margin. Good for stealth grows where noise matters.
Does it work for both veg and flower?
Yes — it's a single full-spectrum recipe (4000K white + 660nm red) designed to run the entire cycle. Use the dimmer to reduce intensity for veg and run full power during flower.
Last updated: April 2026
