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Optic LED GMax 300 Dimmable LED Grow Light (LH351H V2) UV/IR

Best Seller By Optic LED
List Price: $549.00
Price: 420.00
You Save: $129.00 (24%)
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Estimated Arrival 2/11 - 2/15
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Product Description

   *USA Orders: Optic Express 2-5 Day delivery


            GMax 300 delivers the most advanced Green House LED Grow Light Experience on the Planet. 1 Touch Screen gives you full control over multiple GMAX Lights so you can fine tune your lighting system with the Programmable Dimmers, Spectrum Control & Auto Sunrise. Your Gmax 300 Lighting System is fully versatile to grow any type of plants or Crops at any stage in their life cycles and do it at the highest level of performance possible between the Programmable Dimmers so you can set any level light intensity for any point during the day & Spectrum Controls.


             GMax 300 is Equipped with the Latest in Horticulture LED Technology from Samsung with their new V2 LH351H  Deep Red LEDs (3.75 umols/J) which werent expected to hit the mainstream until 2022, LH351H Royal Blue LEDs  and the LM301H full spectrum White light LEDs. GMax 300 sets the new standard for greenhouse style LED Grow Lights with Double Dimmer Spectrum Control and Controller Ports so you can control all of your lights together from 1 touchscreen and showcase the Auto Sunrise in your grow space.


NEW! Samsung LH351H v2 660nm Deep Red LEDs- 3.75 umols/J

Coverage Footprint:


1 Unit                                                

3' x 3' area (.9m x .9m)    

2' x 4' area (.6m x 1.2m)


2 Units                                               

4' x 4' area (1.2m x 1.2m)    

Hanging Height : 

Flower: 10"-24"    

Pro Tips: Wk1-3 @20"-30"  -  Wk4-6 @18"-24"  - Wk7-10 @12"-15" 

Veg: 24" - 30"    (@ 50% Power)

Seedling: 24" (Dimmed Down @ 35%)

Dimmers : 2

Dimmability: 0% - 100%

Dimmer#1 - Deep RED, UV, IR & Warm White LEDs


Dimmer#2 - Royal Blue & Cool White LEDs


Gmax 300 Components: 

LEDs: 780 Total

White LEDs: 

 744 Samsung LM301H Horticulture series 3500k  

Bloom Enhancers:

- 24 Samsung LH351H V2 660nm Deep Red LEDs -

- 8 Samsung LH351H 450nm Royal Blues LEDs - 

- 2 IR and 2 UV LEDs

Optics : 

Samsung LM301H White LEDs: 120 Degree Primary Lens

LH351H V2 660nm Deep Reds: 120 Degree Wide Beam Primary Lens 

LH351H 450nm Royal Blues: 120 Degree Wide Beam Primary Lens 

Driver: Meanwell HBG Series Driver

(Built into a Optic Vented Driver Case with Dimmers & Controller Ports)

Thermal management: Passively Cooled


Full Spectrum White Light 3500k (Mixed White Light LEDs) (Full Power on 2 dimmers)

+ 660nm Deep RED 450nm Royal Blue + ultraviolet + Infrared



PPFD Slim GMax 300: 

(Tested with Apogee MQ-500 meter in 3x3 / .9m x .9m Tent)  

10" Hanging Height PPFD: 1,085


18" Hanging Height PPFD: 

Vertical PAR OutPut: 

GMAX 300 Specifications:

HID/HPS Equivalent: 600w HPS

Kelvin: 3500K DayLight White 

IP Rating: IP65 Waterproof - Green House Rated

PAR Efficacy: 3.0 umols/j 

PPF : 2,903 umols

Master Controller: Compatible with Touch Screen Master Controller (2 ports)

Actual Power Draw: 300 Watts

LEDs per Watt: 2.6

Amps: 3 Amps at 120v (1.5Amp @240v)

Lifetime: 100,000 Hours+  

Warranty: 10 Years full warranty - Lifetime warranty on Meanwell Driver

Release Date: August 2021 

Light Fixtures: GMAX 300

Cables: 6 Foot power cord, rope ratchets and cables included.

Plug: USA, CANADA, EURO, Commercial, Industrial, etc.

(We automatically ship the correct cord for your country)

Dimming: 0-100% Dimming Capabilities (Dimmer Included)

(Works with external touchscreen Master Controller

Dimensions: 22" x 4.5" x 6"

Fixture Weight: 12lbs

Shipping Weight: 14lbs

Grams Per Watt: up to 2.8

Yield: Up to 840 grams / 30 oz / 1.87lbs

Hanger: Comes with adjustable rope ratchets.

Recommended for: Closet Grow, Cabinet Grow & Grow Tents. & Green Houses

Customer Reviews

Based on 2 reviews
How to work this thing

What settings for seedling do i need reds on our blues

Adam Anderson

I mean sure I'll leave it at 5 stars to get the coupon, and so far it is a 5 star product, but how can I give you feedback on a light without having run it for a harvest? I have a few plants in flower under it, ask me again in 45 days

Order Confirmation 

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase.

As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment.

If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail.

If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.

Order Shipment

If your order is stock and we process the charges to your credit card, it will ship within five business days from the date of your order.

The one exception is our grow cabinets. These are made to order right out of California and can take 2-3 weeks before they ship.

Just hang tight, they're worth the wait :) 

We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address your provide when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at

Your privacy is important to us, so we offer discreet shipping on all orders. We ship in plain, unmarked packages via Fedex, UPS, and USPS. For larger shipments such as our grow cabinets we ship via freight and will provide you with a Bill of Landing and tracking information. 


Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery. If your item(s) do arrived damaged, please send photos to and we will process an insurance claim on your behalf.

Cancellations & Refunds

All orders cancelled after 48 hours are subject to a $20 administration fee, whether or not your order has shipped. If your order has shipped, you (the buyer) will also be responsible for actual return shipping charges. Refunds will only be issued to the original credit card that you use when placing your order. 


If you are unhappy with your order for any reason we can help you with a free return within 30 days of receiving the item. You will need the items original packaging to make a return, so please keep it!

Just send an email to and we will take care of you. 

Shopping online is great but it can be hard to know if you’re getting the best deal.

From the the moment you click "Add to Cart", to the day your order arrives at your door, we want your experience with us to be completely stress-free.

If you’re worried about finding a better deal online, now you can relax.


Here's our promise:

If you find another store online that is offering a better price any time within six months of making your purchase, we will cover the difference. 

That’s right, we will send the money straight back to your pocket. If you buy one of our products for $100 and find it online for $90 just send an email to info@allgreenhydroponics with a link to the better priced product and we will take care of it from there.

You’ll get your $10 back right away. 

We offer this price match guarantee because we want you to be able to shop with confidence and not have to worry about if you’re getting the best deal online. With us, you always are. 

There are some requirements for us to price match:

  • We will only price match after you’ve placed an order for the product to be matched.
  • This is not valid for products on sale or offered with other promotions.
  • The product will only be price matched against other online retailers that do not have physical store locations.
  • The competitors website must show the price matched product as in stock.
  • Discount and auction sites will not be price matched (i.e. ebay, groupon, overstock).
  • Only Authorized Retailers of the product will be price matched.
  • Price matching is valid for the item price plus shipping costs, sales tax is not included.