VIVOSUN LumaLight VSL-LL400 400W LED Grow Light, Full Spectrum, Dimmable

At 23.5 inches square, the VIVOSUN LumaLight 400W LED Grow Light is sized for indoor growing setups, with compatibility for 4×4 and 5×5 grow tents. Its full-spectrum LEDs combine white, blue, red, and far-red light for use across plant stages, from seedlings through flowering.

A fixed-output light suits growers who prefer one intensity setting, the LumaLight offers four dimming levels from 25% to 100%, so you can adjust the light to your growing routine. It also works with the VIVOSUN GrowHub E42A or E42A+ for app-based scheduling and remote monitoring, the controller is sold separately.

Tips for day-to-day use

Use the dimming knob to select one of the four intensity levels, from 25% to 100%, according to your plants’ stage and setup. The full spectrum combines 3000K and 5000K LEDs with 660nm red and 750nm far-red LEDs, supporting use from seedling growth through flowering. For app-based schedules and remote monitoring, pair the light with a VIVOSUN GrowHub E42A or E42A+.

The fixture is designed for ceiling mounting and includes a pair of VIVOSUN rope hangers to help suspend it in a grow space. Its IP65 waterproof and dustproof rating is suited to high-temperature, high-humidity growing environments, and the product information says it can be sprayed with water, nutrients, or cleaners.

Product specs

• Type: Full-spectrum LED grow light
• Model: VSL-LL400
• Power: 400W
• Dimming: Four levels, 25%–100%
• Spectrum: 3000K, 5000K, 660nm, and 750nm LEDs
• Dimensions: 23.5 × 23.5 × 3.23 inches
• Material: Iron
• Weight: 17.5 pounds
• Mounting: Ceiling mount
• Grow tent compatibility: 4×4 and 5×5
• Included: A pair of VIVOSUN rope hangers
• Manufacturer warranty: 5 years

What you’ll notice day to day

The square fixture provides a broad light surface for an indoor growing area, while its adjustable output gives you a practical way to change intensity without switching to a different light. The full-spectrum layout is intended to serve plants through multiple growth stages, making it useful for a setup that includes both seedlings and flowering plants.

Buyers frequently praise the light’s brightness and lighting quality, and some appreciate the dimming controls and straightforward mounting. Customer feedback also describes the fixture as running cool. These are reported impressions rather than a measure of results for every growing environment.

Questions before you buy

Which grow tent sizes is this light designed for? The listed compatible sizes are 4×4 and 5×5 grow tents.

Can I control it through an app? App-based scheduling and remote monitoring are available when used with a VIVOSUN GrowHub E42A or E42A+. The GrowHub is sold separately, the light also has a four-level dimming knob.

Is it suited to a humid grow room? It has an IP65 waterproof and dustproof rating and is described for use in high-temperature and high-humidity environments. The product information also notes that it can be sprayed with water, nutrients, or cleaners.

Final verdict

For indoor growers setting up a 4×4 or 5×5 tent, the LumaLight brings together a 400W full-spectrum LED fixture and adjustable intensity in one ceiling-mounted unit. Its seedling-to-flowering spectrum, included rope hangers, and optional GrowHub control make it a practical fit for a growing space where flexible light settings are useful.