Actual Power Consumption: 95W
I’m also seeing lots of new “hybrid” LED grow lights appearing, that contain a mix of big and little LEDs, and unique form factors that mix and match between all the styles.
3.) COB Style
If kept too close, LEDs may cause cannabis leaves to look discolored similar to a nutrient deficiency, even if nutrient levels are fine.
Here are those same plants at week 6 of flowering under the ES300 LEDs
Introduction: Are LEDs a Good Choice for Growing Cannabis?
Actual Power Consumption: 65W
You may not notice this issue since soil (and many grow nutrients) already contain adequate levels of Calcium and Magnesium. Calcium/Magnesium supplemental nutrients are widely available in any grow shop.
A 600W HPS bulb wastes around 450W (75%) of the electrical energy producing heat. A good quality LED light with a 400W power draw would produce around 200W of heat despite having the same productivity as a 600W HPS. So the best LED’s only produce about half the heat of an HPS.
The combined benefits of LED mean that HPS is increasingly looking a dated technology, producing a light spectrum that is not optimised for cannabis and too much heat. LED, by contrast, does not waste energy producing the useless orange/yellow/green wavelengths.
One easy solution is to keep seedlings in the tent corner (which may have lower intensity light compared to the tent centre), or just to raise the light and allow the plant to ‘grow into’ the more intense light as it stretches later.
Growroom heat levels are totally different with LED
The transpiration differences mean that Calcium and Magnesium ions can be less mobile under LED and this may cause deficiencies that you will have to correct with nutrient additions.