How Long To Leave Plant Light On In The UK? The Clue!

If you want to know how long to leave plant light on in the UK, you must classify your plants into seedlings and mature plants. It’s not enough to master when to use a growing light, but you also have to perfect your plant’s light exposure duration. Remember that the polytunnel will only be the perfect plant environment if you can provide the factors that they need correctly, including light. 

According to the University of Maryland Extension, lights are essential for producing sturdy plants. However, you don’t want to leave the plant light over the ideal recommendations. This article will discuss the limits and best duration for leaving the plant light for young and mature plants. 


How Long To Leave Plant Light On. Read This First

How Long To Leave Plant Light On in the UK: Everything You Need To Know



As mentioned earlier, you need to classify your plants to know the duration of light exposure suitable for them. You can leave the plant light on for 16 to 18 hours every day to encourage growth for seedlings. Time for light is longer than the recommendation for mature plants because younger plants require exposure more for their development. 

You can use full-spectrum lights at 6 inches above the seedlings in the greenhouse. The light intensity is also necessary, so the best fixture to use are four tubes. Check your set-up afterwards to ensure that plants receive the light equally and at the maximum intensity using reflectors to reach the plants’ top and sides. 

Mature plants

Compared to leaving the light on for a maximum of 18 hours, more mature plants can thrive best at a duration of 12 to 14 hours. However, do note that different plants will vary on the maximum requirement. Therefore, some plants can grow sufficiently with six hours of exposure, while some only require four hours of intense light every day.

With the former, you can place the lights a foot away, and those with low light needs can have a distance of three feet from the fixtures. You must also keep in mind the intensity required for your plants and if they also receive sunlight. Gardeners in the UK often leave the plant light on for six hours at night if the plants do not receive their optimal requirements during the day. 


How Much Light Do Plants Need In The Greenhouse?

Now that you learn how long to leave plant light on in the UK, the next step is to ensure that you are not overexposing or underexposing your plants to light. An easy way to do this is to create a routine using an alarm and timer to know when to turn on and shut off your lights in the greenhouse. Different systems won’t need manual intervention for your convenience. 

The system will automatically switch the lights on and off for you, but you can also use a simple alarm to notify yourself of the routine. More so, constantly monitor your plants for any signs of overexposure or underexposure to the lights. For example, those that receive light over the limit can experience wilting and yellowing of the leaves, while those that require more light can die because of the failure to do photosynthesis


Light Intensity In The Greenhouse

You must also check the light intensity in the polytunnel to ensure that your plants meet their requirements. You can measure light intensity in foot candles, and to give you an idea, seedlings require 1,000-foot-candles for growth. However, the fixtures’ distance to the plants also plays a role, and the specific requirements of your species will vary. 


Types OfpolytunnelLighting Fixtures


T5 Fixtures

If you’re considering using fluorescent lights, the best fixtures to use are T5 fixtures. They are excellent for growing in the polytunnel because of their long lifespan while also using less energy and causing a low impact on the environment. T5 fixtures are ideal for starting seeds until the plants grow entirely. 


High-pressure sodium fixtures

Another popular fixture that you can have in the polytunnel are high-pressure sodium types. Compared to the first one that is best for starting plants from seeds, these fixtures are helpful if you want to encourage budding and flowering. They are an excellent alternative for the traditional incandescent bulbs for use later in plants’ growth cycle.


LED fixtures

Lastly, the most modern and long-lasting fixtures are LED bulbs. They have a long lifespan and minimal heat output making them more energy-efficient in the long run. You can also choose from different types if you want fixed or programmable fixtures. 



We all know that plants require light for their growth and development, and the invention of the polytunnel allows us to mimic the optimal environment for our plants. Therefore, you must know how long to leave plant light on in the UK to ensure that your plants thrive. In general, younger plants should receive around 18 hours of exposure, while their more mature counterparts can do well with only 14 hours. 

However, the emphasis is necessary on checking the light intensity and distance as well. More so, different plants have different requirements, so that these lengths will vary. The main takeaway here is that younger plants should have their light on for longer than mature plants.


what is the size of a baby crib mattress

What Is The Size Of A Baby Crib Mattress? Read This!

A baby is tiny, but then they also need to have a comfortable sleep since they are one sleepyhead, so, do you have any idea what is the size of a baby crib mattress?

Babies are sensitive; that’s why you should always keep an eye on them.

When it comes to mattresses, you want to find the material suitable for their skin providing comfort and support.

There are beddings with pillows sold as a package for babies.

In that way, you will be able to make sure that they have a good surface and support them when they are sleeping.

Having a soft mattress to lay them in makes their sleep a lot better.

It must be smooth and fluffy so that it would make the baby feel comfortable and sleepier.

Aside from drinking milk, another thing that babies do is cry and sleep.

As a mother, you would not want them to cry all the time.

It would mean too much stress both for the baby and for you.

So, without further ado, let’s discuss!


The Size Of A Baby Crib Mattress

A baby sometimes cries because of hunger, but it could also be uncomfortable and a strange feeling for them.

As I have said, babies are way sensitive. You must be very careful about choosing your things to avoid sudden reactions.

Putting the baby beside you on your mattress is fine, although it would be better to have their bed made for babies.

Mattresses should be soft and mild for the baby so choose wisely.

Include the thickness and, of course, the size of the bed.

But then what size is a standard baby crib mattress? There are a lot of beds found in every part of the world. It mesmerizes me to know about all this.

There are so many types of mattresses produced. It could be traditional, modern, convertible, etc. It is all up to you to choose from your preference.

So, what is the size of a baby crib mattress?

A crib mattress would usually be fifty–one and five – eights (51 5/8) up to 53 inches in length.

Including the width is about twenty-seven and one–fourth (27 ¼ ) up to 28 inches. And its thickness would be around 4 – 6 inches thick.

Familiarizing yourself with this is the right decision, especially when you are having a baby in no time.

A crib is one tool that could help you have some time for other things when your baby is asleep. You can just put them down there and let them rest for a while.

As a mom of an infant, you have no enough time for other things, and you focus on your baby. Babies are very dependent.

And that would mean having them by your side always.

You see, some babies, when uncomfortable with their sleep-wake up in no time.

You have to find the right mattress for them to put into so that their sleep won’t get disturbed, and you can also rest and sleep for a while.

Grab that crib and find the right mattress for it.


Is It Necessary To Buy A Mattress That Fits The Crib?

Well, indeed it is. Of course, it is necessary to buy a mattress that fits into your cribs.

Leaving spaces or gaps free could put your baby in danger.

Remember that your cribs could be their sleeping place up until they are 3 – 4 years old.

And that you have to consider things up to that period.

When a baby starts to crawl, walk or explore they would move more inside the crib.

And you should limit contact with the material as much as possible.

Some cribs have gaps in their structure that could trap up your babies. You have to avoid these situations from happening as much as possible.

And when talking about a mattress that is way bigger than your crib, it would still not go well.

You have to think of how it would like if it laid flat on the surface.

It would just fold upwards, which would affect the mattress’s structure and form.

It would be going up along the sides of the crib and would create a sweltering space.

Mattresses are thick, which could cause to give off some heat from it.

But then it is better that way than a bed blocking the sides.

It could result in a lack of air and could harm the baby. Just try to cut the mattress to the size of the crib’s surface as much as possible.

In an instance, to avoid this, you could learn how to measure your mattress to fit with the crib.

You can check this out, and you are good to go.



When you are carrying a baby inside you, you would want to give him/ her the best things you could when they come out. That includes a good sleeping bed or crib.

Now that we have answered your question, “What is the size of a baby crib mattress?”

I hope that you have an idea somehow and you can prepare for it.

Best wishes and have a good time with your babies!

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