Memorial Day Sale! Mega deals on Grow Light Science, NextLight, Electric Sky, Mars Hydro & more: VIEW DISCOUNTS

Horticulture Lighting Group 260 Watt XL V2 RSpec Quantum Board DIY Kit (Full-Cycle / Flower)  - LED Grow Lights Depot
Horticulture Lighting Group 260 Watt XL V2 RSpec Quantum Board DIY Kit (Full-Cycle / Flower)  - LED Grow Lights Depot

Horticulture Lighting Group 260 Watt XL V2 RSpec Quantum Board DIY Kit (Full-Cycle / Flower)

  • Availability: In stock.
    • Free shipping in the USA (lower 48 states)
    • Free shipping to Canada (excludes taxes)
    • Ships discreetly in 1-2 business days

    260 Watt XL DIY LED Grow Light Kit with Two High-Efficiency QB288 R-Spec LM301H + 660nm Quantum Boards

    Top Features

    • Dimmable down to 20% from 285 Watts
    • 3ft (90cm) long heatsink for a wider spread
    • 500 watt HID replacement (use 2 kits to flower a 4' x 4' space)
    • Veg Footprint 4' x 4' (16 sq ft)
    • Recommended Flower Footprint 3' x 3' (9 sq ft) or 2' x 4' (8 sq ft)
    • 3500K + 660nm white light full spectrum for better results
    • Reliable passively-cooled design
    • Better canopy light penetration with diffused light
    • Ideal for full cycle grows or flowering
    • 1-year manufacturer's warranty


      Kit Includes

      • 2 x QB288 V2 R-Spec USA-made Quantum Boards with Samsung LM301H + 660nm Top-Bin Diodes
      • 1x Slate 2 Triple Predrilled 891mm Heatsink
      • Inventronics LED Driver. Boards should be wired in series with the driver for maximum output.
      • Full-range potentiometer (Video: how to hook up dimmer)
      • 6ft Nema 5-15P 16/3 SJTW NA Power Cord or equivalent for standard 120VAC with cable connector
      • 2ft solid core Wire, 2x Wago Connectors for DC wiring
      • Hanger Clips

      Assembly instructions



      • Dimensions: 89.1cm x 20.5cm
      • Lamp Efficacy with QB288 V2 Rspec 2.6 µmol/J 
      • Board Level Efficacy with QB288 V2 Rspec 2.73 µmol/J
      • No Thermal Interface Material is required between the LED board and the heatsink
      • Remove black plug on driver and use Philips head screwdriver for dimming
      • Kit is shipped disassembled and requires assembly before use
      • Tools required: screwdriver and wire strippers (or scissors). No soldering required. 



      Shipping / Cancellations / Returns

      Order Confirmation

      As soon as you place the order, an order confirmation will be emailed to you. This means we have received your order and payment. Payment is captured as soon as the order is placed. In rare cases, if the product is on backorder or unavailable, we will contact you and ask if you would like to wait for the product to become available, switch your product, or have your payment refunded. If the item is available for immediate shipment (1-3 business days) we will submit the order for processing and arrange shipment.

      Order Shipment

      Most products ship within 1 to 3 business days from the date of your order (unless indicated on the product page). Some items take a bit longer to ship since they are built to order (i.e., Timber Grow Lights, ChilLED Tech, Trimmers, etc). We will send you tracking information as soon as it is available. 

      U.S. Shipping

      We are based in Portland, Oregon with warehouses nationwide. We offer FREE shipping in the lower 48 states (sometimes to HI and AK, too) via FedEx, UPS, USPS or other major couriers (product/brand dependent). Expedited shipping is usually available for an extra cost. Contact us before your purchase if you prefer an expedited shipping method and we will get you a quote.

      After the order is processed, allow 2 to 7 business days for the product(s) to reach you if shipped to a U.S. address. We can ship to PO boxes in some cases. We recommend using a street/residential address instead.

      International Orders

      Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or other couriers. Most quotes can be obtained at checkout. If not, please email us to receive a shipping quote for lights shipped outside of the USA. You may also place an order on our online store for items that require a quote and we will notify you via email on the exact shipping costs. 

      Some items/brands can be shipped for free.

      Items shipped internationally from the USA may have VAT, duties, taxes, and/or local charges due at delivery. These charges are the responsibility of the customer and not LED Grow Lights Depot.


      If you need to cancel your order, we recommend reaching out to us ASAP. We charge a 2.15% (credit card / ViaBill), 2.6% (PayPal), 6% (Sezzle) order cancellation fee once the order has been processed (before it has been shipped). We can accommodate most requests, but due to the different time zones and schedules that our warehouses ship from, the cancellation request may not reach the warehouse in time. Once the item has been arranged to ship or has shipped, the package will be treated like a 'return' and is subject to ship-back fees and restocking fees. All EZTrim orders are final and non-refundable or returnable.


      We offer return shipping in the USA if you are not 100% satisfied for any reason. Many brands have a 90-day return policy. See our full Return Policy for rules and guidance on returning an item after purchase and for brand-specific return dates. A 5-25% restocking fee (brand dependent) may apply for returns within the dates of the return policy. Reach out to us for exact return instructions and restocking fees for the item(s) that you purchased.

      If you have any questions or would like to check the availability of an item, you may email us here or call us at (888) 611-9305. Thank you for shopping with us.

      Shop All LED Grow Lights

      Happy grows!

      Erik H.


      Why shop at LED Grow Lights Depot? This is why....

      1) Thousands of Successfully Shipped Orders and Thrilled Customers

      We have been in business since 2014 and are a highly-trusted online retailer offering honest grow advice and top-of-the-line LED grow lights and other grow/harvest/extraction equipment. We have thousands of 5-STAR PRODUCT REVIEWS from satisfied customers.


      2) Small, Family-Run, Veteran-Owned Business

      Founder/Owner Erik H. overseas that every customer is 100% satisfied with their purchase. If something is wrong, we will make it right, guaranteed! Call, email, or message us anytime and we will get back to you in about 1 business day or less (typically with-in minutes or hours during normal business hours). We have your back!


      3) Free Discreet Shipping in the USA 

      We offer FREE shipping in the lower 48 states via FedEx, UPS, USPS, or other popular couriers. We can ship most other products to Hawaii and Alaska for free too.


      4) Reliable International Shipping Available

      Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or similar couriers. Go through the checkout process to receive a shipping quote or contact us if a shipping quote is not available at checkout. 

      Items shipped internationally from the US may have VAT, duties, taxes, and/or local charges due at delivery. 


      5) No Sales Tax in Some States

      Forget shopping locally or on other popular retail websites that charge tax. You can save a lot of money when buying though us since we do not charge tax in some states.


      6) 100% Low Price Guarantee

      We strive to ensure that we offer the absolute best prices online. Rest assured that you are receiving the best online price when you shop with us.

      If you find a better price online before or after you order from us (for up to one month), we will match or beat the competitor's price.

      Although rare, we may refuse to offer a price match in which we incur a loss.


      7) Easy Interest-Free Financing

      Finance your purchase in minutes! See our available financing options below:

      Buy what you want today and pay for it over four installments, interest-freeLook for the Sezzle button at checkout. Get approved up to $2,500. LEARN MORE.

      No Payments + No Interest if paid in full in 6 months on purchases of $99 or more. Get approved in seconds! Select PayPal at checkout and pay with PayPal credit or APPLY HERE


      8) Route Package Protection

      Adding Route Package Protection to your order at checkout means that your order is protected against being lost, damaged, or stolen. In the unfortunate instance that you experience one of these inconveniences, you can report an issue with Route and they will work with you to make sure you get the resolution you prefer. LEARN MORE.


      9) We are Authorized Dealers offering a Manufacturer's Warranty

      You will buy confidently from us since only sell new, official products (no used items or clones). All warranties are new are 100% honored through the respective manufacturer.


      10) Safe, Secure, Discrete Transactions

      We accept major credit cards, PayPal, Google Pay, Apple Pay, Sezzle, debit transactions, bank transfers, and money orders. All card payments are processed through our encrypted SSL security processing system. Your identity is always protected.


      11) Hassle-Free Returns

      And just in case your purchase was not up to your standards, we offer return shipping if you are not 100% satisfied for any reason. See our FULL RETURN POLICY for full details.

      Customer Reviews

      Based on 18 reviews
      John L.
      Great Light

      This is a beast of a light. I like the DIY packages for the fun of building it. The service and delivery time is always on point.

      Mason B.
      Awesome as always from HLG and this site

      Installing was a little annoying due to the different wago connectors than I’m used to. These were gray and orange opposed to the normal clear ones from last light. The openings seemed too small I ended up using some extras from before. Other than that assembly is easy.

      As far as the light goes, it’s what I expect from HLG and other more dependable LED lights. Plants responding great. I use this light full cycle. Very happy it comes with a dimmer.

      In addition to the light itself I’m very satisfied with this company. I think this is the 4th light I’ve purchased. The third HLG and one California light works. I’m still on a budget so I buy the medium and smaller lights but it is worth it to buy a premium led light as opposed to the amazon specials out there. I’ve never had any issues with any light. They always ship very quickly. They are responsive for all questions. Can’t recommend this company too much.

      Michael M.

      Went together easily. Works like it should. Plants are doing great just into flower. Just right for my 2x4 tent. LED Grow Lights Depot provides great service and follows up.

      Very happy with my leds

      Very happy with my LEDs and with Just finished my first grow, the lights exceeded my expectations

      Jose Z.
      Best light and best light supplier

      Highly recommend led grow light depot , they stand behind quality and great service ! I will keep on shopping with them . Thanks again
      -Chicago grower 😉