Peispud
- Thread starter PeiSpud
- Start date
Well, back in the stone age when people didn't know any better than to use a measurement that is heavily weighted towards the frequencies that the human eye perceives as being brighter (IOW, about 555 nanometres, which is nearly green - a color of light that plants use very little of) and, therefore, a poor measurement in regards to agricultural-use lighting, people generally recommended a minimum of 3,000 lumen per square foot during the vegetative phase and 5,000 lumen per square foot during the flowering phase.
As I mentioned, anything that is based on the lumen - such as foot candles, lux, etc. - should not be used for measuring plant lighting or when calculating how much light is needed. It'll work fine for designing area lighting for human-occupied residential spaces, such as your living room. But plants do not have eyeballs, human or otherwise. It is not an objective measurement, it's a subjective one. Start thinking in photosynthetically active radiation (PAR), which designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. Also Daily light integral (DLI), which describes the number of photosynthetically active photons (individual particles of light in the 400-700 nm range) that are delivered to a specific area over a 24-hour period.
Consider this: You have two different sources of light. One has a higher lumen rating than the other. You have no way of knowing, by that specification alone, which one will be better in regards to growing plants! The one with the lower lumen rating might actually be better.
Here are some links that will help explain this stuff:
(Above links are for informational purposes only.)
Also: Please stop typing your user name into your threads' subject/title boxes, lol. When people use the forum's New Posts and/or Unanswered Threads links to get a list (of them), they will be able to see your user name anyway - and generally depend on the thread titles to tell them what the subjects of those threads are. People might skip over ones that have thread titles that do not reflect subjects they have an interest in and/or knowledge about. In other words, you are doing yourself a disservice by using your forum user name as a generic thread title for all of your threads.
As I mentioned, anything that is based on the lumen - such as foot candles, lux, etc. - should not be used for measuring plant lighting or when calculating how much light is needed. It'll work fine for designing area lighting for human-occupied residential spaces, such as your living room. But plants do not have eyeballs, human or otherwise. It is not an objective measurement, it's a subjective one. Start thinking in photosynthetically active radiation (PAR), which designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms are able to use in the process of photosynthesis. Also Daily light integral (DLI), which describes the number of photosynthetically active photons (individual particles of light in the 400-700 nm range) that are delivered to a specific area over a 24-hour period.
Consider this: You have two different sources of light. One has a higher lumen rating than the other. You have no way of knowing, by that specification alone, which one will be better in regards to growing plants! The one with the lower lumen rating might actually be better.
Here are some links that will help explain this stuff:
Photosynthetically active radiation - Wikipedia
en.wikipedia.org
Daily light integral - Wikipedia
en.wikipedia.org
Understanding Grow Light PAR, PPFD, Wattage And DLI (2023)
How much PAR does my marijuana or vegetable plant need to maximize harvest? Find out the minimum PAR value you plants need before you buy a grow light.
420expertguide.com
The Ultimate Lighting Guide for Cannabis Cultivation
A Science-Based Guide for Understanding Grow Light Terminology and Lighting Options
medium.com
Code:
https://fluence.science/wp-content/uploads/2016/09/High-PPFD-Cultivation-Guide-9.27.16.pdfWhy is PAR Rating a Big Deal for Indoor Grow Light Systems?
Why is PAR Rating a Big Deal for Indoor Grow Light Systems. PAR is one of the biggest factors in whether your grow lights will provide you with the best yield for your garden. PAR is a part of our benchmark measures when testing grow light systems. It can be used to test all types of HID grow...
growace.com
(Above links are for informational purposes only.)
Also: Please stop typing your user name into your threads' subject/title boxes, lol. When people use the forum's New Posts and/or Unanswered Threads links to get a list (of them), they will be able to see your user name anyway - and generally depend on the thread titles to tell them what the subjects of those threads are. People might skip over ones that have thread titles that do not reflect subjects they have an interest in and/or knowledge about. In other words, you are doing yourself a disservice by using your forum user name as a generic thread title for all of your threads.
How to Use a Lux Meter to Increase Cannabis Yields - RQS Blog
Among pH testers, loupes, and refractometers, lux meters are a useful tool cannabis growers can harness to ensure optimal plant productivity and health.
www.royalqueenseeds.com
A better measurement is with a par meter. A PPFD of 400-600 is good for veg, and you want 800-950 for flower.
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