- NextLight 420H Fixture x 1
- NextLight h Series Power Cord (10') x 1
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NextLight 420H Full Spectrum LED Grow Light
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Who This Is For
- You are moving to a silent setup because loud cooling fans in your closet keep you from relaxing in the next room.
- You are upgrading to full spectrum LED because your old lights run too hot and force you to run the AC all day long.
What We Found
- The dimmer knob is very responsive, allowing for tiny adjustments that help prevent light burn on young seedlings.
- We noticed the light spread remains uniform even at the edges, so your outer plants get as much energy as the centre.
- The IP65 rating is the real deal, we have seen these handle high humidity without the diodes ever flickering.
What Users Say
- People using these in tight closets say they finally stopped fighting high heat levels even during summer months.
- Users who moved to this light say they spend less time adjusting heights thanks to the wide, even light distribution.
- Facilities that switched to these reported their electricity bills dropped because the 2.6 efficiency is so high.
NextLight 420H Full Spectrum LED Grow Light
Struggling to find a powerful, efficient, and silent LED grow light for your home setup? The NextLight 420H delivers professional-grade, full-spectrum light in a compact, plug-and-play design perfect for maximizing yields in spaces up to 3' x 3'. Engineered for both vegetative and flowering stages, this 420W fixture eliminates the need to switch lights mid-cycle, providing your plants with the consistent, sun-like energy they crave.
The 420H is part of the renowned NextLight family, known for pioneering the use of bright white, full-spectrum diodes that are now the gold standard in the industry. It features a built-in dimmer for precise intensity control and passive cooling for completely silent operation. With its IP65 rating for water resistance and a robust 5-year warranty, the NextLight 420H is built to perform reliably, grow after grow. For growers with more compact needs, consider the NextLight 150H as an alternative.
What's Included
Features
☀️
True Full Spectrum
Provides a sun-like spectrum ideal for the entire growth cycle, from seed to harvest.
🌱
Optimized Coverage
Perfectly covers a 3'x3' flowering area or a 5'x5' vegetative space with intense, uniform light.
💡
High Efficiency
Delivers an impressive 2.6 PPF/W, maximizing light output while minimizing energy consumption.
🤫
Silent Passive Cooling
No moving parts means zero noise and outstanding reliability, keeping your grow space cool and quiet.
🎛️
On-Board Dimming
Easily adjust light intensity to suit your plants' needs at any stage, preventing leaf burn.
💧
IP65 Wet Rated
Built to withstand the humid conditions of a grow environment, ensuring safety and longevity.
NextLight 420H Specifications
| Specification | Value |
|---|---|
| Energy Use | 420 Watts |
| Input Current | 3.5A @ 120V, 1.75A @ 240V |
| PPF | 1092 |
| Efficacy (PPF/Watt) | 2.6 |
| BTU Output | 1435 |
| Dimensions | 25" x 24.75" x 3" |
| Weight | 12 lbs (5.44 kg) |
| Operating Voltage | 120-277 VAC |
| Operating Frequency | 50/60 Hz |
| Operating Temperature | -4ºF to 104ºF (-20ºC to 40ºC) |
| Life Rating | Q90 > 50,000 Hours |
| Warranty | 5 Years Full |
| Certifications | CE |
| Environment Rating | IP65 Wet Rated |
NextLight 420H Spectrum Analysis
NextLight Full Spectrum LED
NextLight fixtures emit a full spectrum, bright white light which is more sun-like than even your traditional HPS. Using this spectrum you can expect tighter internodal spacing and better overall quality. NextLight continued to pioneer the use of bright white, full spectrum LED, which has now become the gold standard of grow lighting. This spectrum is easy to work under and provides the same sun-like qualities plants love without the high energy requirements and heat.
Support & Manuals
Warranty
All NextLight products carry a Five (5) Year Full Manufacturer’s Warranty from date of purchase. During the warranty period, NextLight, LLC will, at its option, either repair the defect or replace the defective product or part thereof at no charge. This warranty does not apply to any product which has been damaged, defaced, subjected to misuse, abnormal service or handling (including shipping damage) or which has been altered in design or construction. Please follow all instructions and guidelines to ensure the warranty is not voided.
FAQs
What is the actual coverage area of the NextLight 420H?
The NextLight 420H is designed to provide optimal coverage for a 3' x 3' area during the flowering stage and a larger 5' x 5' area during the vegetative stage. This makes it an excellent choice for standard-sized grow tents and rooms.
Is this light suitable for the entire grow cycle?
Yes, absolutely. The NextLight 420H uses a proprietary full spectrum that is designed to take your plants from seed to harvest without ever needing to change the light fixture. It provides all the necessary light wavelengths for both vegetative growth and flowering.
How do I control the light intensity?
The fixture includes a built-in dimmer that allows you to adjust the light intensity. This gives you precise control to match the light output to your plants' specific needs at different stages of their growth, helping to prevent stress or light burn.
Can I connect this light to an external controller?
Yes, for more advanced control and scheduling, the NextLight 420H is compatible with external controllers. It can be seamlessly integrated with the NextLight Control Pro Controller for centralized management of multiple lights.
How does the passive cooling work? Is it noisy?
The passive cooling system uses the fixture's design and surface area to dissipate heat without the need for fans. This means it is completely silent in operation and has no moving parts that can fail, increasing its lifespan and reliability.
What makes the NextLight spectrum effective?
NextLight's full spectrum is engineered to mimic natural sunlight, which promotes tighter internodal spacing, better overall plant quality, and robust growth. It's a bright white light that's easy to work under and has been proven effective for all stages of cultivation. To learn more about their unique approach, check out this detailed NextLight grow lights review.
How does the 420H compare to other NextLight models?
The 420H is a powerful mid-range option ideal for home growers. For larger areas requiring more power, the NextLight Plus Pro offers expanded coverage. For a similar professional-grade alternative, the NextLight Core Pro is another excellent choice in their lineup.
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Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
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