Comprehensive Information on The Research of Houseplants' Exposing Time to Artificial Light (Summarize online )

how much light do plants actually need?

What is the optimal amount of light for the best growth possible?

The time plants or crops exposing to light is a significant factor for indoor growing . since optimal illumination time can maximize the growth potential of plants .but overexposing them to light can also be harmful to plants as well . so it makes sense to research how long should growers hold led grow lights on to make sure that plants can grow nicely.

we all know light is necessary for plants' growth . This is involved in the photosynthesis process which is important for plants. in this process , plants will produce nutrients which are treated as the energy for later growth use . without this energy plants may not grow as healthy as they can be , even will wither and die.

based on what people have researched, we write this post to gather some known and important information on the illumination time of plants in the hope that you can benefit from this or get some inspiration to help your indoor farming .

  view A :  how long should growers have their led grow light on depends on what kind of plant they intend to grow . 

  in this view ,vegetables are divided into four light-exposure types ( see the following picture)  . although all light-exposure time of plants is culculated based on sunlight.however, we also can roughly know that the needed illumination time of various common vegetables via this. when growing plants indoor under artificial light, this can be of value reference for growers.

view B: photoperiodism

Photoperiodism can be defined as the developmental responses of plants to the relative lengths of light and dark periods in a day. They are classified into three types according to the photoperiod: short-day plant, long-day plant, and day-neutral plant. though in most articles how to distinguish long-day plant , short-day plant and day-neutral plant has been expressed in detail. however , there are also a few focuses that we should pay attention to.

-Short-day plants flower when day length is below a certain threshold, while long-day plants flower when day length is above a certain threshold. there are signs that the critical value differs between species.and it is not always divided on the account of  the value  "12-hours" what is special and familiar to most.

       -when coming to control the light-emitting time to affect the growth of plants , It is the length of darkness that a plant experiences that plays the most crucial role. of particular note is the darkness period means the uninterrupted time of darkness time or no-light time . let's give an example to illustrate the point.

intended darkness time :14 hours 

right : keep the planting space without light in 14 hours 

wrong: during the intended 14 darkness hours ,occasionally providing the planting space a short time of lighting time . the darkness time is interrupted . 

for some plants that are sensitive to light such as Poinsettias, kalanchoes and Christmas cactus etc. they flower only when daytime is equal or lower than 11 hours (short-day plants).however, Some plants only flower when daytime exceeds 11 hours (long-day plants). in addition, there are also plants that are not sensitive to the length of daytime at all (day-neutral plants). besides growing plants , some seeds also appear as sensitivity to light .

so the plants or seeds you grow sensitive to light or not  and the photosensitive critical point are all worth to be explored and confirmed before you start planting . since when necessary ,growers can stimulate plants passing from one stage to another by controlling the time of exposing to LED grow light or any other artificial lighting to reach what state they want plants to be.

if the plant you intend to grow is in response to the length of dark and lighting, be sure of the optimal length of daytime or darkness time. as you may harvest more than others according to this optimum. take cannabis for example .

 generally speaking, most species of cannabis belong to short-day plant . that is to say , the daily hours of darkness that cannabis plants require are over 12,especially in transition from vegetative growth to flowering.  it is also the key step to trigger cannabis flowering when growing them indoor under artificial light .

how cannabis growers deal with the lighting time of their plant ?

In general ,  they like to study on the photoperiod of cannabis growing to make sure the optimal number of darkness hours and daytime hours of each cannabis species that will trigger the plant to start flowering or harvest more . In this way, they have greater control over the light output each important phases and will be able to achieve better yields or shorten the flowering time that help to realize economic value fast. here are some results of a wide range of attempts.

if you have any other information of this topic , please kindly send the links to us , we would like collect more information about exposing time of all kinds of plants and regard them as some directions of research .

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