More Light Requires More Nutrients

More Light Requires More Nutrients

Posted by Celia Daly on February 11, 2016 12:00 am
  • Share on Google+

Plants need four essential things to grow: light, water, carbon dioxide (from the air) and nutrients. Each of these things work together to promote vigorous growth and increase yield. The catalyst motivating everything is the amount of light a plant receives. Energy from light is captured by the plant and used to process the carbon, nutrients and water. When plants receive more light, they need more of the other three elements and when they receive less light, they need less of the other three elements as well.


cannabis plant hot spot effect Hot spots, which are common with traditional reflectors, can burn plants.


With traditional reflectors, there will typically be a hot spot in the middle of the canopy underneath the light. The plants directly under the bulb receive more light than those on the perimeter of the canopy. In order to ensure healthy plant growth among all plants, it is then crucial to direct more water and nutrients to the plants in the middle that are receiving more light – which is difficult to do on a large scale. This is one reason we advocate for a max of 4-6 plants per light With only 4-6 plants under each light, it is possible to have a section of each plant directly under the bulb, thus evening out the amount of light each plant receives.

With the Surna Reflector, however, the hot spot has been nearly eliminated. Instead, light is more evenly spread over the plant canopy. Additionally, the Surna Reflector creates up to 9% more light within PAR than traditional reflectors through the use of a patent-pending Quartz insulating sleeve surrounding the bulb.

This additional light means that plants will need more nutrients to increase production. Plants should be monitored closely and steps should be taken to increase nutrient (and water and carbon dioxide) levels to an amount that will allow the plant to grow to its maximum potential based on the amount of light available. After all, the additional light costs nothing, so you should be using it to the fullest extent possible.

The amount of light a plant receives is very closely related to the amount of nutrients it will need. An increase of 9% more light is very likely to lead to an increased nutrient need of roughly 9% as well. Keep this in mind as you plan your feeding schedule. Healthy and efficient plants use everything they are given and are given enough to max out their needs.

Topics: Cannabis Basics, featured, more light, nutrients, Surna Reflector

One response to “More Light Requires More Nutrients”

  1. CBDiva says:

    Thank you for this article!

    I’ve had two grows now where my entire plant–like 85% of the leaves–have gone yellow overnight. No exaggeration. The only thing the two grows had in common was the addition of a 20-watt LED light in Week 7, which is when the yellowing started. But why would a little more light cause yellowing? Because I wasn’t adjusting for the additional nutrient & watering needs, most likely. I can find no other reason.

Leave a Reply

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.


  • This field is for validation purposes and should be left unchanged.

Posts By Topic

See all See less