How long time is suitable duration of sunlight for plants, if led grow light ?

Every plant needs light to grow and flourish, but the right amount of sunlight varies. When choosing plants for your garden, look at the plant label to check its light requirements. No matter what light conditions your garden has to offer, at least something should be able to grow there.

Defining light, from dense shade to full sun
You’ll often see terms like part shade, light shade or deep shade to describe a plant’s light requirements. But isn’t shade just shade? And how much sun does “part sun” mean? This list clears the confusion:
Deep or dense shade, full shade. Look for this on the north sides of buildings and walls or under trees with low branches and dense leaves. No direct sunlight reaches the ground.
Partial shade. Find this in areas that get direct morning sun (on the east side of buildings) or afternoon sun (on the west side of structures) but none at midday, from about 10:00 to 2:00 p.m.
Light shade, dappled shade. Look for this under trees with high branches or sparse foliage.
Part sun. Same as partial shade — except plants that like part sun also tolerate midday sun.
Full sun. These places receive direct sunlight for at least 6 hours or more each day, including some or all of the midday hours.

The warmth of the sun, even more than actual light, inspires flowers to unfurl. Sunlight from the east (morning light) is considered cooler, and western sun (afternoon light) can be scorching. Many plants prefer a site with some morning sun, even until midday, and late-afternoon shade. Other plants are able to endure even the hottest conditions. A plant’s tolerance, of course, varies by region. You can place the same plant in a sunnier spot in the far North than in the South.

If you have plants growing in a spot that receives a blast of late-afternoon sun, be sure to monitor their water needs closely so they don’t dry out. If you find they’re struggling, you can help them by installing something to cast a shadow, such as an arbor, or by planting a tree or large shrub in just the right spot. Even companion perennials or annuals planted nearby can cast enough shade to bring needed relief.



Signs of too much, too little sun
Take a daily walk through your garden to spot-check the condition of your plants. If they’re unhappy with the amount of light they’re receiving, you’ll soon find out by the way the plant
looks.

Here are some signs that a plant is getting too much sun:
Flower petals dry out.
Leaf edges look burnt or dried.
Flower color looks faded or washed out.
The entire plant starts to weaken and droop.
And here are signs that a plant isn’t getting enough light:
Growth is sparse.
Stems are lanky and spindly.
The distance between leaves, where they’re attached to the stems, is especially wide.
You see fewer flower buds and, thus, fewer flowers.
The entire plant leans toward the light sources.
Some of figuring out the proper location for a plant involves trial and error — you’re aware that roses like a full day of sun, but you really want that bush to go in the nook that gets afternoon shade. Give the spot a try. If the plant’s unhappy, you can always move it to a more appropriate spot.



How long time is suitable duration of sunlight  for plants, if you replace sunlight with led grow light?

How Long to Keep Grow Lights on Plants
There' s not a simple response to this question as it depends on many factors. In the first place, different kinds of plants and seeds require a different amount of water and warmth, they also require different light concentration and exposure.

A lot of houseplants and flowers thrive after being on grow lights for sixteen hours, but there are also some of them that need only six hours under the same lights. That' s why you should do research on the plant you want to purchase, not only because of the light but also because of the other factors such as watering and soil.

Dark time is as important as the time spent in the light because it allows the plants to consume all the energy they had previously produced. It' s the same with sunlight – it is not available for 24 hours, plants also grow during the night and need that rest to grow stronger.

Other than the plants' requirements, the light exposure depends on other things as well – light concentration, the grow light you choose and color range of the light.



Different Types of Plants and Light Exposure
If you' re unsure about your plants' needs when it comes to light exposure, I' m going to write those that I consider the most popular plants that the majority of plant lovers own.

Aloe Vera, Orchids, Lettuce, Spinach, etc.
These plants require long light exposure. They will grow its best only if they are on grow lights for up to 16 hours per day.

African Violet, Dumb Cane, Chinese Money Plant etc.
The plants that are in the middle and need around 10-12 hours of light exposure during day require medium light exposure. 

Tomatoes, Peppers, Snake Plant etc.
Finally, in the third category are the plants that grow great with less light exposure and when receiving light for only 6 hours. These plants prefer higher light intensity for a shorter period of time, so they have dark time to consume the energy.

Light Intensity
After checking the number of hours on grow light your plants need, you should also look for a light power they require. Some plants like being exposed to low power for a long time, while some of them prefer higher light intensity for a few hours.

Before installing the lights, make sure you know the preferences of the plant you want to nurture. A lot of manufacturers offer lights with the intensity that can be modified so look for those when purchasing it. You can also change the distance between the plants and light to control the intensity.

Types of Grow Lights
Different needs require different types of grow lights. All of the previously mentioned conditions and characteristics depend on the kind of light you initially choose. There are a few kinds of grow lights you can find on the market: HID grow lights, LED lights, Fluorescent lights, Sulfur Plasma lights, Induction lightning etc.



And while the choice depends on the plants and space you have for your indoor garden, the most popular types are the first two – HID and LED grow lights. At first, I can say that I didn' t understand the difference between these two.

After trying both of them I came to a conclusion that HID grow lights are better for plants that require more light exposure since they produce a lot of heat, so they are also great for plants that like warmth. If you have a lot of space and can keep the grow lights higher from the ground, HID lights will work great for you.

LED lights, however, are better for smaller plant and germination stations. They don' t heat up a lot, and you should buy these if you have plants that grow fine with less light exposure. What I like about LED lights is that they save energy and keep my bills low.

Too Much or Not Enough Light
The same as over-watering, too much light can be bad for your baby plants and flowers, and plants in general. If you leave them under grow lights for too long, or under the light that has strong intensity, the plants can start drying out and eventually die.

This happens because the plant is creating more energy than it can consume. This happened to me a few years ago, and I noticed yellow marks on the leaves of my tomatoes. I immediately reduced their light exposure, and they came back to normal after a couple of days.

On the other hand, if your plants don' t receive enough light, they won' t make enough energy, and they' ll die. So be sure to do thorough research and provide enough light for every plant according to its requirements.

Make sure to follow distance rules that we explained within out proper grow light distance article.

Germination and Grow Lights
Even if you prefer having your plants on the sunlight, grow lights can be a great technique of having a jump start when it comes to the seeds. A nice germination station consists of a heating mat, tray, planters, dome but most importantly – grow lights.

This will help the seeds grow better towards the light and develop healthy and strong roots with the energy they produce thanks to those same lights. Be sure not to over-expose the seeds since the same rules apply as with the plants when it comes to the water and light requirements.

Tips That Can Help
Plants need a routine, and they love receiving light every day at the same time. That' s why you should remind yourself to switch on the grow lights and switch them off after the right period of time. You can always set the alarm to remind you when to do it.

However, if you' re okay with investing more money, you can purchase a timer that will make sure the lights switch off and on automatically. This is a great device if you need to travel and need something to take care of the light exposure of your plants.



Frequently Asked Questions

Can you leave grow lights on 24 hours a day?
No, it is not recommended to leave your grow light 24 hours a day. That' s because so much light could will force plants to grow quickly. Ideally, grow lights should be on for about 12 to 18 hours.

How far should led grow lights be from plants?
The average distance between LED grow lights and a plant should be 12-30 inches from the tops of plants. Gradually, as your plants grow, you can adjust the distance and keep it consistent.

Do plants need sunlight or just light?
All plants require light for photosynthesis. Of course, natural source of light is preferred, but if there' s not enough of it, artificial will do. The only difference is that they won' t progress as fast as they do with natural light.

What type of light us best for growing plants indoors?
Full-spectrum bulbs mimic the natural solar spectrum well, and they ensure a balance of cool and warm light. They are perfect for seedlings in the first place, but are excellent choice for other indoor plants and herbs as well.

Can plants survive without direct sunlight?
Absolutely, some species belong to plants which prefer diffused light, so they don' t have to be exposed to direct sunlight. For example, Cast Iron Plant, Lucky Bamboo and ZZ plant belong to that category.

How much light do spider plant needs?
To make spider plant thrive, ensure 8-10 hours of sunlight daily. This plant prefers bright indirect sunlight.

How long to keep grow lights on succulents?
Darkness is very important for succulents, but they need sunlight as well to develop properly. If you use grow lights for them, it' s best to leave it on between 12-14 hours.

Conclusion
I purchased it a few weeks ago, and I can assure you it will help you a lot because you' ll be able to relax, and you won' t have to organize your schedule according to the spectrum led grow lights for indoor plants and your home!