How Does Light Affect Photosynthesis? Top Ways!

How Does Light Affect Photosynthesis? One of the most important things affecting photosynthesis is light. Photosynthesis cannot take place in the dark, because the plant’s only source of light is sunlight. Even if there is plenty of co2 and water, a plant can’t photosynthesize very quickly if there isn’t enough light. 

The rate of photosynthesis will be boosted if the light intensity is increased. Photosynthesis relies heavily on green light (550 nm). The process requires energy, which is provided by light. Photosynthesis is a chemical reaction that catches light energy and converts it to sugar, as you may know.

How does light affect photosynthesis?

When light intensity is very high, the rate of photosynthesis reduces rapidly as the light starts to harm the plant. This is a critical component of photosynthesis. So, how does light affect photosynthesis?

Photosynthesis occurs at low light intensities and grows until it reaches its peak during the day’s brightest times. Varying plants require different amounts of light. Photosynthesis uses up to 1.5 percent light in the process, therefore high-intensity light is often not a limiting factor. Low-intensity light, on the other hand, becomes a limiting factor since photosynthesis cannot occur without light, regardless of how much water or CO2 is available.

Photosynthesis are of two types; light-dependent reactions and light-independent reactions.

The light-dependent reactions, also known as ATP and NADPH, are the initial stage in photosynthesis and are utilized to generate the energy required to produce sugar molecules during the light-independent reactions.

Light energy is used to ionize water during light-dependent reactions, and the resulting electrons are transported through an electron transport chain in the chloroplasts’ thylakoid membrane. During the light-independent processes, this mechanism generates ATP and NADPH for biosynthesis.

Best Led Grow Lights for Indoor Plants

  1. GE BR30 LED Grow Light Bulb

Every month of the year, this balanced-spectrum bulb provides excellent lighting for houseplants, indoor gardens, cactus, and flowers. It produces soft, natural illumination and warmth, unlike some other grow lamps that create harsh brightness.

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Its well-balanced light spectrum is designed for seeds and greens, allowing you to grow herbs, lettuce, onions, tomatoes, and other crops in your own house. You won’t have to run out and buy a new lamp because it fits in with any standard lamp.

Product specifications

  • Type: Bulb 
  • Wattage: 9 watts
  • Size: 4.06 x 5.94 inches 


  • Less expensive
  • Soft, natural white light
  • Fits in to majority of lamps


  • A nearby lamp is required
  • It only lasts a few months before it burns out.


  1. Feit Electric Dual Full LED Plant Grow Tube Light

Are you looking for a mountable item? The Feit Electric Dual Grow Tube Light is the best. It is portable, long-lasting, and simple to set up. It comes completely built and ready to hang or mount flush to your ceiling or walls.

This device is designed to replicate natural sunshine and can be used as a replacement for typical greenhouse lights. It emits blue light at 450 nanometers and red light at 655 nanometers, a combination that promotes plant development. It also emits little heat, that prevents burnt leaves and lowers your electric bill.

Product specifications

  • Type: Hanging or mounted 
  • Wattage: 19 watts 
  • Size: 23.33 x 4.9 x 1.73 inches 


  • Installation is simple.
  • Great blue/red ratio 
  • Heat emission is minimal.


  • Not recommended for large plants.


  1. Aceple LED 6W Desk Plant Grow Light

Aceple Desk Plant Grow Light is a great device with outstanding results. This grow lamp emits two light colors: red emits 660 nanometers, which is great for flowers and fruits, and blue emits 460 nanometers, which aids photosynthesis.

It has the appearance and size of a reading light, but with all of the energy your plants require. It has a large clip as well as a flexible gooseneck arm. It has plenty of light for a number of little plants. It’s an excellent alternative for households with some plants that need light on an as-needed basis because it’s simple to set up, fold up and store in a drawer.

Product specifications

  • Type: Lamp 
  • Wattage: 6 watts 
  • Size: 2 x 2 x 16 inches 


  • Rubber feet and a strong clamp
  • Lightweight
  • Very portable 
  • Simple to set up


  • Arms and neck are short.
  • There is no timer.
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  1. Roleadro LED Full Spectrum Grow Light

The Roleadro LED Grow Light is the greatest full-spectrum option. Indoor plants benefit from the brand’s unique spectrum, which includes wavelengths ranging from 460 to 465 nanometer, 620 to 740 nanometers, and a 6,000 to 6,500 K waveband.

This encourages growth and enables even the most delicate tropical plants and flowers to flourish and blossom all year. During the winter, spring, summer, and fall, you can also cultivate seasonal vegetables and herbs.

Even on the highest setting, this 75-watt grow lamp features an aluminum cooling plate to properly disperse heat. It includes hanging brackets that can be hung almost anywhere in your home, making it an excellent choice if you have a lot of plants to cover.

It’s the greatest option for seedlings. It has the ideal size for a seed tray and gives an even distribution of light, earning it a perfect 5/5 in terms of effectiveness and brightness.

Product specifications

  • Type: Hanging panel
  • Wattage: 75 watts
  • Size: 10.87 x 10.87 x 0.55 inches


  • Various light sources
  • Excellent for seedlings
  • Even distribution of light


  • Timer function is not available
  • Difficult to set up


iPower 10W Dual Head LED Grow Light

The iPower LED Grow Light features 2 adjustable gooseneck arms and 2 light heads, but the lamp’s adjustable necks are not the only item that can be adjusted. It includes 11 dimmable settings and 3 light modes, red, blue, and a red/blue combination.

For a 24-hour cycle, you can set the smart timer to switch off after a specified number of hours and then switch on at the same time the following day. This grow light comes with a wide mounting clip that you may use to secure it to a desk, table, shelf, or other slender ledge.

Product specifications

  • Type: Lamp 
  • Wattage: 10 watts 
  • Size: 4.53 x 3.15 x 13.78 inches 


  • Adjustable gooseneck arms
  • 2 light heads
  • 3 light modes
  • 11 dimmable settings


  • Not recommended for large plants

What to Consider when Buying a Grow Light


Consider how many plants you’ll need to cover when deciding on the size of grow light you’ll require. Also, if you plan to move your light from place to place, you may prefer something lighter and more portable, however if you know it will stay set, this may not be an issue.

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Also, think about where you’re going to put it and make sure there’s enough space for it to function properly without hitting furniture, drapes, or other objects.


Grow lights come in a variety of shapes and sizes, from panels to ones that dangle from the ceiling or screw into a conventional light fixture. The kind of plants you have, the amount of natural light available, and the location of your plants will all help you limit your options.


When it comes to grow lights, wattage isn’t as significant as you may think, but it’s still worth thinking about. The photosynthetic photon flux density is the more relevant parameter, as it determines how much light a lamp emits.

Wattage is a good tool to find the appropriate fixture for your plants because this is a bit tough to figure out. Most indoor plants (particularly herbs) may get by with a lower-watt light because the rule of thumb is 32 watts per square foot.


What causes photosynthesis to be stimulated by light?

The energy of particular wavelengths of light is absorbed by special pigments in the chloroplasts of plant cells, generating a chemical chain reaction known as the light-dependent processes of photosynthesis. The best visible light wavelengths for photosynthesis are in the blue (425–450 nanometers) and red (600–700 nanometers) ranges.

What is the rule of light in photosynthesis?

Photosynthesis happens more frequently in blue and red light rays than in green light rays, which occur less frequently or not at all. Blue light is the light that is best absorbed, hence it exhibits the highest rate of photosynthesis, followed by red light. The plant can not absorb green light, therefore it can not be used for photosynthesis.

What role does light play in photosynthesis?

Photosynthesis is the conversion of carbon dioxide  and water  into carbohydrates by green plants using the energy of light. Chlorophyll, a photosynthetic pigment of the plant, absorbs light energy, while carbon dioxide and oxygen-rich air enters the plant through the leaf stomata.

Conclusion on How Does Light Affect Photosynthesis?

In order to grow, everything needs energy. Our food provides us with energy. Photosynthesis is a mechanism by which plants obtain energy from light. This is how light affects plant development. A plant cannot produce the energy it requires to grow without the help of light. 

Different pigments in chloroplasts absorb different wavelengths for use in photosynthesis, therefore the rate of photosynthesis is affected by the various wavelengths of light a plant is exposed to.