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COB Horticultural Led

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Horticultural COB LED: The Game-Changing Concentrated Lighting

Horticultural COB LEDs (Chip-on-Board) are revolutionizing indoor grow lighting with their technology of multiple chips mounted on a single substrate. Unlike classic dispersed LEDs, COBs concentrate impressive light intensity over a reduced surface, creating an ultra-powerful light point perfect for precisely targeting your grow areas. This concentration allows for high PPFDs with fewer light sources.

Why choose a horticultural COB LED

COB technology offers exceptional light density that far surpasses traditional LED panels. With wattages ranging from 50W to 200W per COB, you get the equivalent of several dozen classic LEDs concentrated in a single point. The spectrum is generally optimized between 380nm and 780nm with peaks in deep red (660nm) and royal blue (450nm). Thermal management is crucial: each COB generates significant heat that requires an appropriate heatsink, often made of aluminum with fins for efficient dissipation. The beam angle varies between 60° and 120° depending on the model, allowing for precise directional lighting.

How to choose your horticultural COB LED

The wattage depends directly on your grow area. For a 60x60cm tent, count on 100-150W actual COB power. An 80x80cm will require 200-300W, and a 120x120cm will need a minimum of 400-600W. Always check the actual power consumed, not the advertised equivalent power. The full-spectrum with added far-red (730nm) boosts flowering. COBs with lenses concentrate light more but reduce the covered area – perfect for tall, dense plants. Without a lens, the spread is wider but less intense. The heatsink should be at least 3 times the size of the COB for efficient passive cooling.

Frequently Asked Questions

What wattage of horticultural COB LED should I choose for a 60x60 cm tent?

For a 0.36m² surface, aim for 100 to 150W actual horticultural COB LED power. This wattage will give you a PPFD between 400 and 600 µmol/m²/s, ideal for growth and flowering. Avoid COBs over 200W for this surface as you risk burning your plants and wasting energy. A single well-positioned 100W COB will be more effective than several small, dispersed COBs.

What distance should I maintain between my horticultural COB LED and the plants?

Maintain 30 to 50cm between your COB and the top of the plants, depending on the wattage. For a 100W COB, 40cm is sufficient. A 200W requires a minimum of 50-60cm. Monitor for signs of light stress: leaves turning white, browning edges, or stunted growth. Use a lux meter to precisely measure the intensity received by your plants. Adjust the height according to the phases: higher during growth, closer during flowering.

Are horticultural COB LEDs with lenses better for light penetration?

Lenses do indeed concentrate light and improve penetration into dense canopies, changing the angle from approximately 120° to 60°. They are perfect for tall plants with a lot of foliage. However, they reduce the illuminated surface and create more pronounced shaded areas. Without a lens, you cover a wider surface better but with less intensity in the center. The choice depends on your growing style: dense SOG or voluminous individual plants.

How to install a horticultural COB LED with its heatsink?

First, attach the COB to the heatsink with thermal paste to ensure heat transfer. Tighten the mounting screws in a cross pattern for even distribution. Connect the wires respecting polarity (red = +, black = -) and use a driver adapted to the voltage and current of your COB. Mount the assembly on an adjustable support and ensure that air circulates freely around the heatsink. A 12V fan can be added for active cooling if necessary.

How to maintain a horticultural COB LED for long-lasting performance?

Regularly clean the heatsink fins with a dry brush to prevent dust accumulation, which reduces thermal dissipation. Check electrical connections every 6 months for oxidation. Avoid thermal shock by allowing it to cool before complete shutdown. Monitor the heatsink temperature: it should never exceed 80°C to the touch. A well-cooled COB can operate for 50,000 hours, which is more than 5 years of 12h/day use. Replace the driver if you notice flickering or a decrease in intensity.

Help & advice

Frequently asked questions

About COB Horticultural Led — click a question to see the answer.

What is a horticultural COB LED?

A horticultural COB LED, short for Chip-on-Board, is a lighting technology where multiple LED chips are directly mounted onto a single substrate. In practice, this creates a very dense and powerful light source, capable of delivering concentrated light intensity to a specific growing area. This is what distinguishes it from classic LEDs where the chips are more spaced out.

What is the difference between COB LED and classic LEDs for indoor growing?

The main difference lies in the concentration of light. COB LEDs group many chips on a small surface, offering very high light intensity and a deeper penetration effect, much like a spotlight. Classic LEDs, often in the form of panels with individual chips, diffuse light more uniformly over a larger area. I would say COBs are ideal for targeting specific areas with a lot of power.

What wattage of horticultural COB LED should I choose?

The wattage of COB LED to choose will depend mainly on the surface area of your growing space and the specific needs of your plants. For a small area (for example, 60x60 cm), a 100-150W COB may be sufficient. For larger areas or very demanding plants, you will need to increase the power, or use multiple COBs. What I look at above all is the target PPFD for the growing area, because wattage alone does not tell the whole story about light efficiency. Do not hesitate to consult guides to refine this choice.

What is PPFD used for with horticultural COB LEDs?

PPFD (Photosynthetic Photon Flux Density) is an essential measurement for horticultural COB LEDs, as it indicates the number of light photons useful for photosynthesis that reach a given surface per second (in µmol/m²/s). In short, it tells me how much light your plants are actually receiving. A COB, due to its concentration, can generate very high PPFDs, which is ideal for stimulating growth and flowering. I always recommend relying on this value to evaluate the efficiency of lighting, rather than on raw watts.

What is the installation distance for a horticultural COB LED?

The installation distance of a COB LED is crucial and depends on its power and the needs of your plants. Given their high intensity, I generally advise starting with a greater distance than with classic LEDs, for example between 40 and 60 cm above the canopy, then gradually adjusting. The goal is to achieve the desired PPFD without burning the leaves. It is important to carefully monitor your plants for any signs of light stress. For more details on lighting, you can consult this article.

What light spectrum for horticultural COB LED in growth or flowering?

The choice of light spectrum is paramount. For growth, I recommend a spectrum with a dominance of blue, which promotes robust and compact vegetative development. For flowering, a spectrum rich in red and infrared is ideal for stimulating the production of flowers and fruits. Many modern COBs offer so-called 'full-spectrum' spectra that cover both phases, but some are optimized for specific phases. It is important to check the manufacturer's specifications to ensure that the spectrum matches your goals.

How to install a horticultural COB LED?

Installing a horticultural COB LED is generally simple. I advise you to hang it securely using the provided cables and hooks, making sure it is well centered above your growing area. Be sure to respect the recommended distance by the manufacturer, or the one you have determined. Also ensure good ventilation in your growing space, because even if COBs are efficient, they generate heat. Finally, plug it into a secure electrical outlet and use a timer to manage the light cycles.

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