How to build a cob grow light? 420 Guide for Cannabis Beginners

What is COB LED lighting?

First, not all LED lighting is created the same way. LED stands for light emitting diode. A diode is an electric component which has two terminals. The electric current causes the diode to send off a bright light which surrounds a small bulb. A COB LED grow light is a little different than a standard LED light. COB stands for chips on board and refers to the fact that this style of light has multiple LED light chips built into one module instead of many individual modules. This gives the appearance of a lighting panel as opposed to individual tiny bulbs.

 FANS

Most COB LED grow lights include fans because they’re necessary – the heatsink isn’t enough to quickly dissipate the heat produced. These fans help protect the life of the LEDs, and they help reduce the heat your plants will feel when they get close to those lights.

 Why even consider building a LED grow light yourself?
Good grow LED tech is expensive. With 2-4 $ per Watt you can end up paying thousands of dollars on the best lights.
The advantage of this is mostly, that you get a finished plug&play module with things like warranty and product testing. In the case of DIY LED Kits sold by Horticulture Lighting Group, this is not the case. The sets you buy there are great, but its way cheaper to build them on your own.

All LED grow lights are wired in series by connecting the driver’s positive site to the positive side of the first LED. The same LED`s negative side connects to the next LED`s positive side, continue this until you reach the last LED, connect the remaining negative LED terminal to the negative side of the driver. In the below wiring diagram the potentiometer and resistor are only needed if an externally adjustable driver is used.



 Power up the cooling

 Now that the light works, the last step is to connect the cooling to the power. This is why you have to buy a 4-Way Y-connector. This is used to wire all the fans on the coolers together. Then you just connect the remaining wire to a sufficient power source (12 V, 1 A) and you are done. The cable from the Y-connector has four wires and are color coded as shown here. You only need 12VDC and GND to run the fans. If you are clever you make use of the PWM cable as well to lower the rotation speed if needed.

Best COB Grow Lights 2020

Optic COB Grow Light
Optic LED Optic 2 Veg Gen3 COB Grow Light 150W IR (5000K COBs) - LED Grow Lights Depot

The Optic 2 Gen3 light features 50% more powerful COBs and over 40% more light output overall, while using the same amount of power. It combines 2 CREE COB LEDs with 32 Bridgelux/Epistar 5 watt LEDs, giving you the best of both worlds. And it does so at an unheard of price for a top-quality LED light.

This version features a mix of warm white COBs with a color temperature of 3000K and cool white COBs with a temperature of 5000K making it the perfect full-cycle light. If you want a light specialized for vegging, check out the 5000K version.

If you need more than one, select one of the bundled options above and save big.

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