This is one of Mars Hydro’s best-selling lights for a reason. Sitting neatly at 300 watts, designed for 4’x4’ vegetative coverage and a focused 3’x3’ flowering footprint, the TSW2000 hits the sweet spot for tents, cupboards, spare rooms and shelves where efficiency actually matters. Affordable, dependable and deceptively powerful, it’s become the default choice for growers who want strong results without drama.

Serious Output without the Power Bill Panic.

The TSW2000 pulls 300 watts from the wall and delivers a hefty 776 μmol/s of PPF, with a PPE rating of up to 2.6 μmol/J. In real-world terms, that means it comfortably replaces a traditional 400–450W HID setup while using around 40% less electricity.

Daily running costs sit at well under a pound per day, even on UK tariffs. And with estimated yields pushing 2.0–2.3g per watt, the return on investment becomes painfully obvious very quickly. This is a light that pays for itself while barely warming the room.

Mars Hydro didn’t chase headline wattage numbers here. They chased usable photons, efficiency and consistency - which is exactly what matters when you’re growing indoors.

Bridgelux Diodes. Spectacular Output. 

The TSW2000 uses high-quality Bridgelux LEDs, arranged across a wide quantum board to produce even, uniform coverage. No harsh hotspots, no dark corners, no guessing games with plant placement.

The spectrum spans 3000–3200K and 6000–6500K whites, backed up with deep red 660–665nm and additional 730–740nm infrared. That means balanced energy across the entire PAR range, supporting healthy development from early growth right through flowering.

The output looks remarkably similar to traditional HID lighting - but without the inefficiency, bulb degradation, or heat load. It’s full spectrum lighting without the usual compromises.

High Quality Reflective Hood. 

One of the most overlooked features of the TSW2000 is its highly reflective aluminium hood, engineered with a 120-degree refraction angle. This isn’t just cosmetic metalwork - it actively reflects scattered photons back down towards the canopy.

Mars Hydro claims up to 25% improved light utilisation, and in practice it shows. Plants receive more usable light without increasing intensity, which means better penetration and stronger development without the risk of stress or burn.

It’s clever, simple engineering doing exactly what it should: wasting less light and making more of what you’ve already paid for.

Silent, Fanless & Cool Operation.

Noise is often the unspoken killer of indoor grows. Thankfully, the Mars Hydro TSW2000 makes none. With zero fans and zero moving parts, this light operates at a glorious 0 dB.

Heat management is handled entirely by a thick aluminium heatsink across the rear of the board, dispersing heat via passive convection. The result is a heat output of roughly 1023 BTU, which is impressively low for a light of this output.

Better still, the driver is removable and comes with a 2-metre extension cable, allowing you to mount it outside the tent entirely. Less heat inside the grow space, more control over your environment, and fewer headaches all round.

Fully Dimmable. Built To Last. 

The TSW2000 includes a manual dimmer, letting you adjust brightness from 0% to 100% depending on plant stage, distance, or environmental conditions. It’s simple, responsive, and does exactly what it says on the tin.

Running multiple units? No problem. The daisy-chain feature allows up to 30 lights to be linked together and controlled from a single master unit - ideal for larger rooms or multi-tent setups.

Super Lightwieght. Ultra Longlife.

Despite its output, the light weighs just 3.7kg, making installation effortless even in smaller tents. It ships in discreet packaging with a full hanging kit and is ready to go in under five minutes.

Mars Hydro doesn’t mess about when it comes to build quality. The TSW2000 is CE, ETL, RoHS and UKCA certified, rated for 50,000 hours of lifespan, and backed by a multi-year warranty with proper UK support.

No bulb replacements. No fan failures. No fiddly maintenance. Just a solid, dependable LED grow light that turns electricity into results with ruthless efficiency.

Phenomenal Value. Phenomenal Performance. 

The Mars Hydro TSW2000 LED Grow Light isn’t flashy, and it doesn’t need to be. It’s efficient, quiet, powerful and astonishingly cost-effective. For anyone running a 3’x3’ or 4’x4’ space who wants strong performance without noise, heat or financial regret, this light is a no-nonsense winner.

It’s proof that good engineering, sensible power, and smart design still beat gimmicks every time. Plug it in, dim it to suit, and let it do what it does best - deliver consistent, high-quality indoor growth, cycle after cycle.