Vivosun Vs4000 LED Grow Light

The VS4000 delivers 400 watts of full-spectrum LED output, drawing roughly 450 watts from the wall due to driver efficiency. It uses a mix of high‑output 660 nm red and 450 nm blue diodes, complemented by a white light blend for a balanced spectrum. The unit measures 24" × 12" × 2" and weighs about 12 lb, making it easy to mount in most grow tents. Its built‑in heat sink and fan system keep temperatures under control, extending diode life.

Vivosun built the VS4000 with a metal alloy frame and a durable polycarbonate cover that protects the LEDs while allowing optimal light transmission. The integrated cooling fan runs on a temperature‑sensing controller, which only activates when needed, reducing noise. The power cord includes a 150‑amp fuse for safety, and the unit comes with mounting brackets and a hanging kit for flexible installation.

The VS4000 is marketed for the vegetative and early flowering stages of most indoor crops, including cannabis, tomatoes, and leafy greens. Its spectrum promotes strong stem growth and leaf expansion, while the higher red output begins to encourage budding in the later weeks. For full‑cycle growers, many pair the VS4000 with a supplemental high‑intensity red light during the final flowering phase.

The VS4000’s full‑spectrum design covers 380‑780 nm, mimicking natural sunlight. It combines blue (400‑500 nm) for vegetative vigor, red (640‑660 nm) for flowering, and white (500‑600 nm) to fill gaps, ensuring photosynthetic efficiency. By providing a balanced mix, the light reduces the need for separate “grow” and “flower” bulbs, simplifying your setup.

Measured in Photosynthetic Photon Flux (PPF), the VS4000 outputs about 900 µmol/s. Its Photosynthetically Active Radiation (PAR) distribution is fairly even across the 400‑700 nm range, delivering a peak intensity of roughly 600 µmol/m²/s at a 12‑inch distance. This makes it suitable for dense canopies where uniform light penetration is essential.

Unlike some competitors, the VS4000 does not have a dimming function built into the unit, but you can achieve intensity control with an external dimmable ballast or by adjusting the hanging height. Some growers use a timer to switch between a 18‑hour veg cycle and a 12‑hour bloom cycle, relying on the fixed spectrum to cover both phases.

The VS4000’s 450‑watt input yields roughly 900 µmol/s of PPF, giving an efficiency of about 2 µmol/J. While not the absolute highest in the market, this ratio is respectable for a mid‑range unit and translates to lower electricity bills compared with traditional HPS fixtures.

LEDs generate less heat than HPS lamps, which means you’ll spend less on cooling and ventilation. The VS4000’s built‑in fan only runs when temperatures exceed 70 °F, cutting unnecessary power draw. Additionally, the reduced heat load helps maintain a stable grow environment, improving overall plant health.

When you factor in the initial purchase price, typical lifespan (≈50,000 hours), and reduced cooling costs, the VS4000 often pays for itself within the first 12‑18 months of operation. For growers on a budget, the modest electricity usage (≈0.45 kW) makes it a financially viable option.

For optimal intensity, hang the VS4000 12‑18 inches above the canopy during veg and 18‑24 inches during bloom. This spacing delivers the target 600 µmol/m²/s without causing light burn, while still providing sufficient coverage for a 4 × 4 ft area.

The unit’s rectangular shape creates a uniform light field across its 24‑inch width. At a 12‑inch distance, you can expect a ±10 % variance across a 3 × 3 ft zone, making it ideal for central placement in a standard grow tent. For larger tents, consider using two VS4000s side‑by‑side.

When growing dense canopies, space plants 12‑18 inches apart to ensure each receives adequate light. If you’re using a sea‑of‑green (SOG) method, you may need to lower the light slightly to avoid hotspots, or supplement with reflective material on the tent walls to improve distribution.

The VS4000 ships with adjustable hanging hooks and a sturdy metal bracket. You can mount it from the ceiling of a grow tent, a wall rack, or a dedicated frame. Ensure the mounting point can support at least 15 lb to accommodate the unit plus the fan.

Connect the unit to a dedicated 120 V outlet using a heavy‑gauge power cord (minimum 14 AWG). Plug it into a surge protector or a GFCI outlet to guard against voltage spikes. Never daisy‑chain multiple high‑wattage lights on a single circuit without checking the amperage rating.

Use a digital timer to automate the light cycle. A common schedule is 18 hours on/6 hours off for veg, switching to 12/12 for bloom. Pair the timer with a temperature/humidity controller to keep environmental conditions stable.

Dust accumulation reduces light output. Every 2‑3 weeks, gently wipe the polycarbonate cover with a soft, dry microfiber cloth. For stubborn grime, use a lightly dampened cloth with a mild soap solution, then dry thoroughly before powering the unit back on.

Check the cooling fan monthly for dust buildup. Use compressed air to clear the fan blades and heat sink fins. A clean fan maintains the temperature‑regulated operation that extends LED lifespan.

Vivosun provides a 3‑year limited warranty covering manufacturing defects. Keep your receipt and register the product on the Vivosun website to streamline claim processing. Customer support is reachable via email and a dedicated phone line for troubleshooting.

The Spider Farmer SF‑4000 offers a slightly higher efficiency (~2.3 µmol/J) and a built‑in dimming function. However, the VS4000 is generally priced lower and includes a more robust metal housing. If budget is a priority, the VS4000 gives comparable PAR output for less money.

Mars Hydro’s TS‑4000 is often cheaper but lacks the high‑quality fan system found in the VS4000, which can lead to higher operating temperatures. The VS4000’s better heat management translates to a longer expected lifespan, making it a smarter long‑term investment despite the higher upfront cost.

Viparspectra’s V4000 includes a digital dimmer and a more expansive spectrum with far‑red diodes. The VS4000 compensates with a sturdier frame and a longer warranty. Choose Viparspectra if you need fine‑tuned intensity control; stick with Vivosun for durability and ease of use.

Start veg at a 12‑inch hanging height to encourage compact, vigorous growth. As plants mature, gradually raise the light by 1‑2 inches each week to maintain optimal intensity without causing burn. During bloom, a 18‑inch distance balances flower development and leaf health.

Line the interior of your grow tent with mylar or reflective fabric to bounce stray photons back onto the canopy. This can boost overall PAR by up to 15 %, reducing the need for additional lights.

Higher light output increases plant metabolic demand. Pair the VS4000’s intensity with a nutrient regimen that supplies adequate nitrogen during veg and increased phosphorus and potassium during bloom. Monitor leaf color and tip burn; adjust feed rates if you notice yellowing or curling.

Keep temperature between 70‑80 °F and humidity around 50‑60 % during veg, dropping to 40‑50 % in bloom. Use a digital hygrometer and thermostat linked to the same timer as the light to maintain stable conditions, preventing stress that can negate the benefits of a high‑quality LED.