If kept too close, LEDs may cause cannabis leaves to look discolored similar to a nutrient deficiency, even if nutrient levels are fine.
Unlike CFLs, LEDs don’t need to be adjusted almost daily
How Far to Keep from Plants: 34″ is the recommended starting distance from the plants.
Actual Power Consumption: 184W in veg, 368W in flowering (this model has a separate vegetative and flowering mode)
LEDs vs Other Popular Cannabis Grow Lights
Note: Unlike a lot of other brands, ViparSpectra LED grows lights have both a heatsink and built-in fans to help keep grow lights cool.
Average Yields: 3.5-5+ ounces – keep in mind that the strain (genetics) and any plant training you do makes a huge difference in your final yields.
These plants seem apparently healthy, but the top leaves keep getting lighter and lighter because the LED grow light was too close. If you don’t realize it’s light burn, the symptoms are inexplicable!
Electric Sky LED grow lights (The Green Sunshine Company)
Actual Power Consumption: 300W at full power, dimmable
ES180 found on Amazon (sometimes) or order directly The Green Sunshine Company website
As a plant that does not have sufficient lighting in veg will not produce as well in flower. That said, the spectrum with the most blue did produce the flower with the most terpenes and THC.
When it comes to building an ROI comparing LED versus HPS be careful with results that are supplied by manufacturers of only one type of light source. I have seen manufacturers on both sides of the argument manipulate numbers to favor their specific light source. Below is an outline of things to look out for when receiving an ROI comparing lighting technologies:
Cannabis Research in Canada
With LEDs most will use μmol/J (“Micromoles per joule” with joule being a measurement of watts). This is easy math you can do yourself.
Determining ROI between LED and HPS
There is a lot of information out there on the internet from various growers and lighting suppliers. You can find a contradiction to almost every point you find! Most growers agree that for young plants through the veg stage of growth you will want to have a light source with a good amount of blue light or even white (full spectrum) lighting. The main reason for this is to reduce internode stretching to produce a stockier, healthier plant.