First of all, it is essential to understand that plants perform different chemical processes in darkness and light, adapting to environmental conditions for their survival and growth.
In the Light: During the day (or under artificial lights), plants carry out photosynthesis, a process that converts light, carbon dioxide (CO2), and water (H2O) into oxygen (O2) and glucose (C6H12O6). Light is captured by chlorophyll in the leaves, allowing the transformation of solar energy into chemical energy stored in glucose, a sugar that serves as a source of energy and building material for the plant.
In the Darkness: At night, when no sunlight is available, plants primarily perform cellular respiration. This process uses oxygen to break down the glucose generated during the day, releasing energy, carbon dioxide, and water. Unlike photosynthesis, respiration occurs both in light and darkness but is more prominent in the absence of light when photosynthesis ceases.
These processes are fundamental to the life cycle of plants.
What is the best light cycle for autoflowering plants indoors?
The short answer is: It depends. The most commonly used cycle is 20 hours of light and 4 hours of darkness. However, this can vary depending on your location and conditions. For example, if you cannot control the temperature and are growing in the summer with temperatures above 28°C (82°F), it’s best to use a reduced light cycle, such as 18/6 or even less. Remember that lights increase the temperature inside the grow space (and the electricity costs).
Ideally, you should be able to control variables such as temperature, humidity, and air extraction. Under these conditions, you can maximize the potential of your autoflowers and join the great debate on whether the best cycle is 20 hours of light and 4 hours of darkness or even 24 hours of light and no darkness.
Do Autoflowering Plants Require Darkness?
The short answer is: No, you can grow your autos on a 24-hour light cycle.
Whether autoflowering plants need darkness and what the best light cycle is for their optimal development is a topic of discussion among growers.
Under ideal conditions, the most common light cycles for autoflowers include 24/0 (24 hours of light, 0 hours of darkness), 20/4, and 18/6. Each of these cycles has its advantages and can be adjusted according to the needs of the plants and the growing environment. Some growers believe that autoflowering plants need a period of darkness and may not grow as healthily on a 24/0 light schedule, although there is no conclusive evidence on this.
The 20/4 cycle has become popular because it provides a balance between robust growth and energy economy, allowing the plants some time to “rest” without consuming as much energy as a 24/0 cycle. In comparison, the 18/6 cycle is the most common and is considered sufficient for healthy plant development, especially useful in hot climates.
Experts from Royal Queen Seeds emphasize that there is no consensus on whether autoflowering plants grow better with 18 or 24 hours of light. Some growers opt for the 24-hour light cycle to maximize production, while others prefer the 18/6 cycle, arguing that the hours of darkness provide the plants with a brief “recovery” period, essential for healthy growth.
In summary, while autoflowering cannabis plants can grow under any light conditions and do not need a total darkness period each day to complete their life cycle, at autoflowerx, we recommend providing them with a period of darkness, especially during the last weeks of flowering. This can help increase resin production and improve the maturity of the terpenes.
Autoflower light intensity
In this fascinating world of autoflowering cannabis cultivation, one of the most critical factors for ensuring healthy growth and a bountiful harvest is proper light management. Current technology provides us with simple and affordable tools to precisely control light intensity, a key variable that directly influences photosynthesis and plant development.
What is a luxometer?
A luxometer, commonly known as a light meter, is a specialized device used to measure the intensity of light in a specific environment. This instrument measures the amount of light perceived by the human eye, providing readings in lux, the standard unit of measurement for illuminance or light level. By measuring visible light in an area, the luxometer helps create optimal lighting conditions, which are essential for specific activities or for the growth of plants in controlled environments.
What are the optimal light values for autoflowering growth?
- Seed Stage: 5,000–7,000 lux
- Vegetative Stage: 15,000–50,000 lux
- Flowering Stage: 45,000–65,000 lux
How to take a measurement?
Position the device at the top of the plant and turn it on. The value displayed applies to that specific spot. To measure other parts of the plant, move the device downward. The goal is to achieve uniform light levels across most of the plant, which is why techniques like SCROG, SOG, and LST are important—they help evenly distribute light. If you need to increase lux levels, simply move your light closer to the plant. Always maintain a minimum distance to avoid burning the plant tips with the lamp’s heat.
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