Generally, the most common marijuana vegetative stage light cycle is 18/6 (light/darkness) but it can be any combination of light and darkness (like 20/4, 19/5, 17/7) as long as they don’t get more than 12 hours of darkness per day as this will trigger flowering. Light schedules for cannabis vegetative stage.

Though some growers insist that giving their autos a full 24 hours of light maximizes growth in the vegetative stage, others stick to 18-hour light cycles. The latter group argues that the plants need a “recovery” period in order to achieve healthy growth. Though both groups may have a point, autos do well in both 18, and 24 hours of light.
Also, LEDs are built to last at least 50.000 hours or more while bulbs last a maximum of 10.000 hours but the downside is that LEDs go for $100 to $1000 whereas you can find bulbs for as little as $50, so if you’re planning on buying an LED there are a couple of things that you should have in mind, such as the photosynthetically active
Autoflower light schedule. All cannabis plants need light to live, but autoflowers are unique. Automatic plants can flower under a number of light schedules. Common light schedules for autoflowers include 24/0, 20/4, 18/6, and 12/12. However, the right schedule for you will depend on a number of factors. Autoflowers, as recommended by seasoned growers, grow best when given light between 18 to 24 hours per day but there are scenarios that a grower also needs to provide only 12 hours of light on a given day. In this article, we will try to explain the details behind the autoflower switch to 12/12 light exposure and when they are ok or not ok to use.
Light Schedule For Autoflowering Strains. As the name suggests, autoflowering strains don’t require a change in the light cycle to enter the flowering stage. Many growers choose to keep their autoflowers on a light schedule of 18 hours on and 6 hours off during the entire growing cycle.
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how many hours of light do autoflowers need