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See The Light - A Basic Lighting Guide For Growing Marijuana At Home

Proper lighting can make the difference between low and poor crops for high-quality crops. So what is important to know about lighting in order to harvest fat and sticky flowers that will do the job?

Plants in general and cannabis in particular are very fond of light - plants have the wonderful ability to utilize the energy of light (which they usually receive from the sun's rays) and convert this energy into "chemical energy" that, together with carbon dioxide (which is in the air) Usually in water). The plant produces carbohydrates and admires its metabolic process, which will eventually lead to the growth of flowers and fruits.

As opposed to other elements such as fertilizer and water needed by the plant, but if they come in high quantities it may cause a delay in growth and even death of cannabis - with the light situation is not so and in fact can be said on this subject that "everything adds to the best. The stronger the light, the better the plant, the photosynthesis process will be more efficient, the cannabis will grow faster and produce a large amount of flowers. When you present things this way you can get the impression that there is not much to expand on the subject and "the more light the better." And this is true as a principle, but there are still some things to understand about our light and cannabis ...

When we consider everything related to light and the growth of cannabis, there are two very important parameters that will help us to understand which illumination is most recommended for a particular habitat during the various stages of growth:

1. lumens - "Lumines" (lm) is a unit for measuring the intensity of light absorbed by the human eye. Beginner growers tend to think that the amount of watt on the lamp package represents its efficiency but it is not accurate and our plant knows how to use light energy based on the amount of "lumens" produced by the bulb.

for example:

  • Standard 110 standard flourescent bulbs will produce slightly more than 10,000 lumens.
  • The MH bulb ("Metal Halide" - we will expand on it later) of 400 Watt will produce in the 35,000 Lumen environments.
  • The HPS bulb ("high pressure sodium" - which we will touch later) of 400 watts will produce about 45,000 lumens.
  • 600's HPS bulb will already produce almost 100,000 lumens ...
    • MH bulb - suitable for the growth stage of cannabis
      MH bulb - suitable for the growth stage of cannabis

      A glance at these data helps us understand why professional breeders use florescent bulbs only for cuttings and young plants because the relatively small amount of lumen produced by the bulb makes it only in the area nearest the lamp to the light that the light is properly absorbed.

      Read more: Cannabis varieties are easy to grow - especially recommended for beginners!

      Of course, when we approach the design of an incubation room, we will take all this into consideration when we choose to select the appropriate bulb for a particular growth space.

      Here is a list with recommended catalog of breeding space according to wattim:

      • A light bulb of 150w will be suitable for an area of ​​50 cm2.
      • A light bulb of 250w will be suitable for an area of ​​65 cm2.
      • A light bulb of 400w will be suitable for an area of ​​80 cm2.
      • A light bulb of 600w will fit into an area of ​​1.

      Of course none of these measurements is "Torah from Sinai" and there are other important parameters that influence how the plants utilize light energy such as circulating air in the room, proper watering, carbon dioxide and so on.

      2. Spectrum - Another equally important metric that is very worthwhile to understand is the "spectrum" of light. The spectrum in the sense we are dealing with relates to the wavelength and temperature of the light produced from it. We humans may not really pay attention, but during the seasons, the light that comes to us from the sun changes when in the winter the light temperature is lower (around the 3000 Kelvin - cold light) than the summer light temperature (about 5000 Kelvin - light) "). The wavelengths of light are measured in nanometers - photosynthesis takes place in the spectrum between 400 and 700 nm, with peak activity recorded in 435 nm (blue tint) and 675 nm (red tint).

      When we grow cannabis, we always strive to imitate nature, so we will make sure that during the first stages of the growth, cannabis will receive a "cold" light that simulates the winter period (February, March, April) - the growth period in nature. Summer (August and September - October) when cannabis goes to its flowering stage.

      The light spectrum in the Norel NGL is suitable for the flowering phase
      The light spectrum in the Norel NGL is suitable for the flowering phase

      Of course, today there are quite a few options for artificial lighting that will be an excellent solution for any situation:


      In the past few years, there have been quite a few innovations in the field of lighting for home-grown energy saving, and in the Florentines sector, the technological world has been upgraded to our advantage as more and more growers are growing with fluorescent and reporting successful crops. But despite the good feedback, most growers still prefer to use fluorescent bulbs only for the early stages of growth to take advantage of the low heat they produce and also because of the blue light it gives the plant.

      Fluorescent CoolWhite - gives the plant a blue / white light that is suitable for the growth period
      Fluorescent WarmWhite - will give the plant a red / yellow light that is suitable for flowering.

      Although, as we have already said, most growers tend to avoid flaking their cannabis under fluorescent lights.

      Bulbs MH - "Metal-Halide"

      MH bulbs are suitable for the growth period, producing a "cold light" that encourages cannabis to grow in a "compressed" manner, thus preventing it from over-prolonging and improving final output by growing more interconnected nodes, ).

      Lamps have a relatively long life span of more than 10,000 hours. Although it is recommended to change the light bulb when you reach the ten-thousand-hour point because the light output decreases over time.

      Read more: Methods to germinate marijuana seeds - guide

      HPS High Pressure Sodium Lamps (NGL)

      HPS bulbs are suitable for the period of flowering and produce "hot light" which (along with changing the light times) is a "trigger" for the hormonal change that occurs in a plant that encourages it to produce flowers. LNG bulbs are considered to be most effective when referring to the lumen ratio they produce on each watt: more than 100 lumens per watt. A superior ratio that placed these bulbs at the top of the efficiency table in the field for many years, when only in recent years have succeeded in producing other bulbs that are able to produce such a quantity of lumens per watt. Another advantage of GNP is life span - almost double that of metal halide with less than 20,000 working hours. Although here, too, it is recommended to replace the light bulb when you reach the 18,000 point due to the decrease in output.

      Many growers who can not invest their money in the two types of lamps and have to be satisfied with working with one bulb throughout the growth stages prefer in most cases to use HPS mainly because it has a significant advantage over MH when it comes to final flower production. Although some growers tend to avoid growth in the growth phase with HPS, claiming that its orange shade is unsuitable for the plant at the early stage of the tumor and that this light promotes long and unhealthy growth, there are already several solutions to the "bulb replacement"

      Dual Spectrum Bulb

      As part of the "drive of improvements" that the domestic industry has undergone over the past few years, companies in the field have succeeded in developing a light bulb that will illuminate a wider spectrum of colors and thus give the plant the light color required throughout the growth cycle. The bulb is called a "Dual Spectrum" and can be obtained at any store selling home-grown equipment.

      Growing under a fluorescent bulb T5
      Growing under a fluorescent bulb T5

      LED Bulbs (LED)

      There are good reasons for LEDs - first of all the LED operates in a technology that allows it to consume a significantly lower amount of electricity and traditional LNG and metal-halide lamps so that it can grow silently without worrying about the account Scary electricity. In addition to saving energy, the LED, like the Dual Spectrum, can fit throughout the life cycle of the plant without having to change the light bulb in the middle - there is the possibility to switch between blue and red lighting and adjust accordingly. Since the bulbs consume relatively little 1500% of electricity from the other bulbs, and the life of the bulb is 5000 (!!), it is certainly possible to say that this is a possibility that should be considered ...

      Growing marijuana using a LED bulb
      Growing marijuana using a LED bulb

      Read more: Guide to growing cannabis (marijuana, grass) at home

      Some Comments:

      As we mentioned at the beginning of this article, light is indeed one of the most important and influential elements of your tumor, but it is still only one of the elements - and in order for the plant to take advantage of all the light we make sure it is important to make sure about other factors in the environment such as good circulation, In time, correct input and so on ...

      • Despite the reports of quite a few breeders of good results in growing cannabis under Led bulbs, there is still debate among many growers whether these bulbs can reach the same results as the traditional LNG and MH lamps ...

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