Mars Hydro, a Hydroponic Supplier Spotlight 0

This month we feature one of our trusted supplier partners, Mars Hydro. From a small beginnings, they have grown their company into a global provider of premium LED grow lights.

The Top 5 Fan-less LED Grow Lights 1


LED grow light technology is still new and rapidly evolving. While LEDs are much more efficient than traditional HPS/HID grow lights, they still output heat.

To manage this, most LEDs have built-in fans to move the heat away from the diodes and keep them from overheating and getting damaged. While this method of heat management works, it has a few drawbacks.

First, the fans themselves have a lifespan and can break or be damaged. Every additional component in your light is a potential point of failure. If the fan breaks then it has to be fixed or replaced if you want to continue using the light during your grow.

Fans also accumulate dust, dirt, and other buildup from your grow room. This means they have to be regularly cleaned in order to operate effectively. Many grow lights don’t account for this in their design and make it difficult or impossible to easily clean the fans. If you’re using one light then this is a minor issue, but if you’ve got more than this can be a huge pain.

Finally, while most fans are advertised as “silent”, many end up being pretty noisy, which can be annoying.

Many LED manufacturers are catching on to these issues and some of their latest designs have eliminated the need for fans entirely.

They do this in a few different ways such as adding much larger heat sinks, opting for newer hyper-efficient low heat output diodes, and increasing the overall surface area of the light to reduce areas of highly concentrated heat.

On top of not requiring a fan, these lights tend to have a lower overall heat output, run more efficiently, and have a longer lifespan compared to LEDs with internal fans. 

Here are some of the best options for fanless LED grow lights: 

1) Spectrum King SK402

Wattage: 460 Watt

Price: $799.00

Recommended Coverage Area:

  • Veg: 36 sq ft (6 ft x 6 ft)
  • Flower: 16 sq ft (4 ft x 4 ft) 

The SK402 is the newest and most popular light by Spectrum King. The all around white coating gives better intensity on the outer edge of your canopy. Perfect for plants that are particularly sensitive while only using a fraction of the energy. Safety Certified and IP65 Rated. With water resistant housing the SK402 LED Grow Light is perfect for wet and humid environments. Guaranteed to lower your overall ambient room temperature.

You can choose to add a manual dimmer which enables turning the power down to as low as 10% power for more control when needed.

 The features include 

  • Full spectrum LED, that runs with a blinding intensity
  • Low heat levels - solves temperature issues, particularly in summer
  • Great as both supplementary lighting and as a standalone
  • Speeds up vegging times
  • Features a level of light penetration that gets deep into the canopy
  • Built using Cree LEDs
  • Built to last - engineered to the highest standards
  • Highly energy efficient
  • Ridiculous PAR rating!
  • 50000 hour lamp life
  • Wide-angled for a better light spread
  • UL listed.

 2) NextLight Mega 

Wattage: 650 Watt

Price: $1525.50

Recommended Coverage Area:

  • Veg: 49 sq ft (7 ft x 7 ft)
  • Flower: 16 sq ft (4 ft x 4 ft) 

Another best seller. The NextLight Mega produces a high intensity full spectrum light designed to efficiently replace any DE 1000w HPS on the market. This bright white LED grow light is named the “Mega” not for its size but for the increased production and large footprint it will supply to your canopy. Using only 650 watts, this light is perfect for growers looking to cover larger areas using less.

NextLight’s full spectrum provides the same sun-like qualities plants love without the negatives of high energy requirements and high heat. Using NextLight’s full spectrum you will see faster growth, tighter internodal spacing and increased production overall.

The Mega is designed to meet the needs of commercial and home growers alike. The excessive power consumption, bulb replacements and heat are the biggest problems indoor growers face. The NextLight Commercial Series alleviates all of those issues. Coming in at 2.15 PPF/Watt, the Mega is one of the most efficient lights on the market. On top of that, they have some of the best service and support available and the Mega is even DLC certified and UL listed - perfect for a commercial grow operation.

3) Electric Sky ES300

Wattage: 300 Watt

Price: $695.00

Recommended Coverage Area:

  • Veg: Up to 3' x 6’ 
  • Flower: Up to 2.5’ x 5’’

The Electric Sky ES300 is a 300 watt wideband grow light that uses the newest spectrum and light distribution technology. The patent-pending GS1 spectrum grows plants faster in veg and creates larger flower yields. Industry-first linear lenses send light in two directions, providing both downward intensity and side-to-side uniformity to avoid hotspots. Beginner and expert growers will appreciate the ability to fine-tune the canopy of light by adjusting the positioning of units to create the perfect Electric Sky for any garden size.

  • Exclusive & scientific “GS1” Spectrum contains a special color ratio that tells your plants to grow big leaves & stems for exponentially faster vegetative growth.  Growers frequently report 2x growth speed vs Metal Halide and T5 light sources.
  • Wideband LED technology activates the hidden “supercharger” in plants for massive flowering results.  Older “white” and “purple” LEDs miss a color region that HPS Bulbs and new Wideband LED technology can reach. 
  • Replaceable LEDs and components. Replace yourself or send in to them for an upgrade to a brand new light for a fraction of the cost.
  • Industry-first linear lenses focus light in an “aisle” for evenly distributed yet powerfully intense light above and below the canopy.  Large “sweet spot” vertically and horizontally. Grow “Higher and Wider” even in small areas.

4) Horticulture Lighting Group HLG550

Wattage: 515 Watt

Price: $1049.00

Recommended Coverage Area:

  • Veg: 36 sq ft (6 ft x 6 ft)
  • Flower: 20 sq ft (4.5 ft x 4.5 ft or 4 ft x 5 ft)

The HLG500 indoor horticulture LED Lamp is designed to replace a single ended 1000W HID. Each lamp uses 4 custom designed high efficiency white light Quantum boards. With a total of 1152 Top Bin Samsung LM561C S6 LED's, this fixture produces 1160 PPF with just 510 Watts.

The HLG550 is one of the most affordable fan-less lights if you are on a budget. 

Top features include:

  • High efficiency white light Quantum boards
  • White lLight full spectrum for better results
  • Better canopy light penetration with diffused light
  • Ideal for veg and bloom
  • Dimmable Power Supply included

5) Spectrum King 140 Closet Case

Wattage: 140 Watt

Price: $349

Recommended Coverage Area:

  • Veg: 16 sq ft (4 ft x 4 ft)
  • Flower: 9 sq ft (3 ft x 3 ft) 

Another great light from Spectrum King. The Closet Case is just what the name says, a dedicated LED light for smaller spaces with full spectrum capability. It works great as a light for a single plant and is perfect in tight spaces where heat output can be hard to manage.

Cool running and using only 140 Watts the Closet Case is an LED grow light built to the highest standards. Complete spectrum output will ensure your plants are happy and healthy. 

Features include: 

  • A great light to keep your plants going strong also designed to work for the entire grow and flower cycles.
  • Replace your old T5 banks, CFLs and any HPS up to 250w with these high efficiency LED grow lights built for closets, tents and smaller grows
  • Rugged IP65 Rated waterproof housing makes it perfect for harsh environments
  • Efficient heat sink minimizes radiant heat, which can be problematic in small tent environments.
  • Specially designed 90-degree reflectors spread light evenly to your plants.
  • Each light ships with a six-foot power cord, hanging clips and bracket for easy installation.
  • Safe for outdoor use

Compared to traditional LED grow lights, fan-less LEDs are more efficient, easier to maintain, have a longer lifespan with less that can break, and run completely silent.

If you're looking to upgrade your current LED grow lights or are making the switch from HID lighting, you should definitely consider the advantages of forgoing the fan!

  • Trevor

Black Friday and Cyber Monday Deals 2017 0

Black Friday and Cyber Monday are Coming Up Quick!

We'll post all of our deals here so that you can get the best deal on your next LED grow light and other grow gear. Some of these deals haven't started yet but we're letting you know about them now so you're ready when they do.

Last Update 11/23. Added Electric Sky, Kind LED, Lush Lighting, NextLight, and SuperCloset deals. We'll keep updating as new deals are announced!


25% off all grow lights. No coupon required.

Valid: 11-24 - 11/27

Black Dog LED 

20% all grow lights. No coupon required.

Valid: 11/24 - 11/27

Electric Sky

20% off all grow lights. No coupon required.

Valid: 11/24 - 11/27

Kind LED

20% off all grow lights. Use code KINDFRIDAY.

Valid: 11/24 - 11/27

Lush Lighting

10% off all grow lights. Use code LUSHFRIDAY.

Valid: 11/24 - 11/27


20% off all grow lights. Use code NEXTLIGHTFRIDAY.

Valid: 11/24 - 11/27

Optic LED

1 Free Optic 1 when you order an Optic 4 or Optic 6 Grow Light. No coupon required.

Valid: 11/24 - 11/27

Spectrum King

10% off all lights. No coupon required.

Valid: 11/24 - 11/27


10% off all grow cabinets, grow rooms, and hydroponic systems. Use code SUPERCLOSETFRIDAY.

Valid: 11/24 - 11/27

Unit Farm

15% off all lights and tents. No coupon required.

20% off all light and tent packages. No coupon required.

Valid: 11/1 - 11/31


Don't forget we now offer financing for all order over $199. Find out more here.



  • Trevor

The Top 5 Best COB LED Grow Lights for Every Grower 0

COB chip on diode LED

As a grower you're always on the lookout for the best and brightest when it comes to new grow light technology. A good source of light is the best investment you can make for big healthy plants and huge yields. That's why you should be looking at COB LED grow lights, they don’t only blow traditional HPS  bulbs out of the water, they’re also a big step up over standard LEDs.

COB (Chips on Board), is a new technology of LED packaging for LED light. Multiple LED chips are enclosed together as one lighting unit. When turned on, they look like a single light source instead of multiple individual lights. Slowly but surely, these COBs are taking the grow light market by storm.

The main advantages of COB LED grow lights over regular HID and standard LEDs are:

  • Improved electrical efficiency so you save energy and reduce power costs.
  • Highest usable lifespan of any grow light technology so you won't be replacing them any time soon.
  • High Color Rendering Index (usually over 80) and broad spectrum for large healthy plants.
  • High quality COB LEDs will outperform HID technology at the same power consumption.

Here are our top 5 COB LED grow lights recommendations so you can finally replace your big, bulky, and hot HID grow lights.

1) Optic 6 COB LED Grow Light

Optic 6 LED Grow Light

First up is one of the newest and most affordable COBs on the market, the OPTIC 6 COB LED Grow Light.

Wattage: 620 watts

Cost: $749

Recommended Coverage Area:

  • Veg: 5' x 4' (Max 6' x 5')
  • Flower: 4' x 4' (Max 5" x 4')

The Optic 6 comes with a mix of three 3000k COBs and 3 of 5000k COBs for an even full spectrum for your plants. It's a full cycle COB LED grow light designed to be able to grow from seedling through flowering with the most efficient spectrum at every point along the way.

The 3000k COBs add a lot more red to the overall spectrum which gives it amazing capabilities in flowering.The secondary diode array combined with the COBs produces a maximally efficient spectrum and high quality glass lenses magnify PAR output by up to 200%.

2) Amare SolarECLIPSE 450 COB LED Grow Light with UVB

Amare SolarEclipse 450

Wattage: 450 Watts

Cost: $1145

Recommended Coverage Area:

  • Veg: 4.5' x 4.5'
  • Flower: 4'x 4'

Amare uses the latest LED technology to provide an intense, uniform, and natural white light for your plants for every phase of growth. Amare is one of the most reputable brands around and their track record of success has given them a large loyal fanbase. This is one of the highest quality COB grow lights out there.

Some unique features of this light:

  • COB Technology gives a full white light spectrum ranging from 410nm to 760nm.
  • Integrated UVB bulb to maximize late stage bloom resin production.
  • Dual operating modes for Veg and Bloom.
  • Modular Arrangement gives you the flexibility to start small and expand later.
  • Removable lens allows you to focus intensity where you need it.
  • Quiet fan and oversized heat-sinks mean it's always running cool.

3) Mars Hydro COB 100W LED Grow Light

Wattage: 100 Watts

Cost: $232.99

Recommended Coverage Area:

  • Core coverage: 2.5'x2.5'
  • Max coverage: 4.5'x4.5' (veg)

If you’re a first-timer for COBs or just want to get your feet wet before diving in with something bigger, the Mars Hydro COB is a great place to start. It works well for a single plant or a mother plant so you can try out how you enjoy the COB at a very affordable price.

It offers complete protection against particles and water so it can handle any grow environment.

4) Cirrus 1K LED Grow Light

Cirrus 1K COB LED Grow Light

Wattage: 1000 Watts

Cost: $999.00

Recommended Coverage Area:

  • 4.5' x 4.5'

This innovative addition to the Cirrus line is the highest yielding LED grow light in its price range. The Cirrus 1K utilizes full-spectrum driverless COBs paired with high performance heat exchangers. This cutting-edge design allows for greater cooling, light-output, and efficiency.

It is truly one-of-a-kind with a 1000 watt power draw for less than $1000.

5) Optic 3 Dimmable COB LED Grow Light

Wattage: 170 Watts

Cost: $499.00

Recommended Coverage Area:

  • Vegetative: 4' x 4'
  • Flower: 3' x 3'

Another great option from Optic LED, the Optic 3 is the only light in this lineup that can be fully controlled (timing and dimming) by remote control. If you’ve got a multi-light setup the remote can be a huge time saver. The American made CREE CXB3070 COB is specifically designed for horticultural lighting. It gives the same full spectrum light as the Optic 6 in a smaller package.

A unique, toughened, and ultra-clear optical lens guarantees high light transmittance up to 97% - no energy waste!

COB LEDs have quickly gone from a new, untested technology only usable by people willing to build their own grow lights to a mature product that offers some of the best light available for your plants. You get stronger canopy penetration and greater efficiency than a traditional LED grow lights plus none of the heat and energy issues of HID bulbs

COBs used to be out of the price range of most growers, but now that they’re more affordable it’s a great time to jump in a test them out. Once you do, you won’t be going back to your old lights!

You can see our whole collection of COB LED grow lights here.

If you have any questions, don’t hesitate to contact us. Whatever your growing situation or experience level, it is our pleasure to help you grow! 

  • Trevor

New Products - Optic COB LED Grow Lights 0


We now have the entire line of Optic COB LED grow lights available in the store!

All of these grow lights use the latest COB diode technology and offer a full white spectrum with powerful canopy penetration.

Want to replace your 1000W DE HPS? Check out the Optic 6, it has a 5 ft x 4 ft footprint and will give you the same results with nearly 40% energy savings.

Want maximum control? The Optic 3 is fully dimmable and can be completely configured via remote control.

Looking to grow a single plant or just start trying COBs? Then go with the Optic 1, it's perfect for a mother plant too. 

All Optic LEDs feature CXB3590 diodes, Meanwell drivers, a 5 year warranty, and can be shipped worldwide.


  • Trevor

Current Culture Recirculating DWC Explained 1

Current Culture H2O Under Current

We recently had a customer write in asking a bunch of great questions about Current Culture Under Current hydroponic systems. Instead of keeping all that juicy info between us we've decided to share the Q & A session with all of you. 

Here it is, enjoy!

FYI, RWDC = Recirculating Deep Water Culture - the hydroponic growing method used by Under Current systems.

How is RDWC advantageous over ebb and flow and other popular systems?

Production (Increased yields)

Under Current systems constantly expose your plant's root zones to nutrients. This is different from many other popular hydroponic growing techniques, such as ebb and flow, that limit exposure. This means that plants always have access to the nutrients they need and don't have to expend extra energy searching for them. This saved energy is translated directly into increased growth rates. These increased growth rates directly improve your yield and quality.


Better water usage. There is no run off like in a drain-to-waste system, and very little water is lost to evaporation due to the bucket design.

All the water goes straight to your plants.

The higher levels of aeration and the root zone's constant exposure to nutrients allows for more efficient nutrient uptake. Taken together, you're saving water as well as (often expensive) nutrients with RWDC.


These systems are designed with complete automation in mind. They're directly compatible with top-off reservoirs, water chillers, nutrient dosers, etc so you can grow under a controlled, reproducible, automated settings that will consistently yield amazing results.

How thick are the walls of the RDWC grow containers?

Thickness is important because as we stress these systems with a grow, you want to be sure that your buckets can handle it.

We've seen buckets in other hydroponic systems actually start to crack after a 1-2 grows under normal use. This doesn't happen with Under Current systems.

The grow buckets are a hefty 1/8" thick.

Does the germination process need to change for plants to acclimate to RDWC or does keeping it simple still work?

No changes are necessary.

At what point do you transfer seedlings to the RDWC system?

This depends on if you're using an aerocloner, rockwell, or want to start cuttings straight into the system.

In general, your plants are ready to transplant once they have a healthy rootmass.

You can also start cuttings straight in the system but will have to adjust your water levels. You'll want to keep the levels at 1/5" under the top of the net cup's 2" planting deck.

How does the system physically support plant size as they grow larger? Is the crisscrossing string support system still the best solution?

The crisscrossing/trellis netting will definitely work and is a pretty cheap option, but if you want something with more structure we also have module cages available to provide complete support as your plants get big.

Current Culture Module Cage

How does RDWC prevent root rot and water borne diseases/insects from harming plants since the roots are always in the water?

There are two big factors to preventing root rot / Pythium:

  1. Water temperature

    If your water is too warm, you're asking for trouble. 68F is a perfect temperature to keep it at. We reccommend using a water chiller with all Under Current systems.

  2. Use a root zone optimizer.

    We recommend UC Roots. This will help break down any organic biofilms - eliminating the breeding grounds for potential pathogens.

Does RDWC work in a grow tent or is it designed for a grow room or does the system do well in both?

These systems work well in a grow room or a grow tent. If you're using a grow tent it might be eaiser to keep your epicenter and top-off reservoir outside of the tent.

Let us know and we can make the modifications to your system for no extra charge.

What grow light brands do you prefer for the full spectrum/power usage/heat factors?

We sell a number of high quality LED grow lights that work well with hydroponic systems. Here's a few to look into depending on your needs:

Does using an RDWC system significantly reduce mold/fungus issues on the plant leaves etc OR how do you keep that issue from becoming a disaster?

Your hydroponic system is not going to have a huge impact on the plant leaves. Managing this will mostly be up to maintaining the proper conditions (temperature, humidity, avoiding contamination) in your grow room. That being said, removing soil removes an environment that can harbor some of these pathogens and using hydroponics helps on that front.

Does an RDWC system need to be taken apart and cleaned after each crop, and if not then how does the system stay clean?

The system does not need to be taken apart but it does need to be cleaned. Here are the instructions courtesy of Current Culture:

  1. It is best to clean the system immediately after each cycle/harvest.
  2. Pull out root mass and discard air
  3. Remove debris from the system with a shop vac.
  4. Wipe down air hose, net pots and lids with sterilizing solution on a green pad or wash cloth.
  5. Fill the system with tap water and sterilizing solution to the top of the buckets, run for minimum 4-6 hrs.
  6. Scrub inside of modules with green pad and inside joints with bottle brush.
  7. Rinse out the system with a hose while draining till drain water is clear.
  8. Drain remaining solution down as far down as possible.
  9. Remove remaining water with shop vac or sump pump.
  10. Wipe dry with a towel.
  11. Let dry fully under HID lights to aid in sterilizing.


Do you have your own questions? Ask below!

  • Trevor