Lumens vs PAR

Lumens are used to assess human eyesight, whereas PAR (photosynthetically active radiation) is used to monitor plant development. This is why it's significant.

Lumens and PAR: A Comparison.

Humans need lumens, while plants use PAR. There isn't much of a connection between the two.

Lumen, which is measured in foot candles or LUX, is a unit used to describe how well the human eye can distinguish between different levels of brightness.

The light energy that plants "see" to photosynthesize is called PAR (photosynthetic active radiation), and it is measured in quantum photon flux.

Since PAR is a quantum measurement, it is difficult to convert to LUX. Since different colour wavelengths of light move at very minor variations in speed, we may calculate PAR by applying a complicated quantum equation to each wavelength.

The total amount of solar radiation (PAR) that the sun emits at wavelengths between 400 and 700 nm is linked to the best possible photosynthesis in plants.

The total brightness of a light source, or LUX, is related to what human eyes are able to see. They represent how each person perceives the light photons. one for ourselves and one for the plants. Our eyes see a light source as brighter the greater the LUX level.

The spectrum that plants absorb or perceive is known as PAR. The intensity of the light source for the plants increases with increasing PAR.

Can PAR be measured using LUX metres? The quick response is no. With the use of a straightforward equation, you can use them to roughly measure full-spectrum white light and compare the results to PAR. However, this computation will be drastically off if the lights are more red or blue in colour.

A specialised quantum sensor is used to measure PAR.

The photosynthetic photon flux density, or PPFD, used by these sensors to represent PAR. If someone is said to be growing at 1000 umols/ms, this indicates that their PAR level is 1000 PPFD.

As measurement distance from artificial sunshine changes, so do the PAR values. PPFD will decrease sharply and exponentially as you get farther away from the light source. This is true because, in comparison to the sun, artificial light sources only produce a small number of photons. For every 12" of distance from an artificial light source, PAR normally decreases by 50%. Additionally, grow light manufacturers do not utilise a standard to calculate PAR.

PPF (photosynthetic photon flux), which measures the entire amount of photosynthetic energy a light emits, is a standard used in lighting laboratory measurements. However, this measurement is not a reliable indicator of the PAR levels at the distance between your plants and the grow light. This is due to the size of the light and the near proximity of every diode. Although they may have the same rated PPF output, two 600 watt grow lights that are 4' x 4' in size and 5' long by 6" wide will have drastically different PAR values at various distances from the light.

Depending on the grow environment and available CO2 levels, plants in the blooming stage of growth perform best between 800-1000 PPFD and can be successful up to 1500 PPFD. Plants may withstand higher levels of PAR if additional C02 is provided to the growing area. On the other hand, vegetable plants like light levels between 250 and 400 PPFD. Additionally, clones and young seedlings can barely endure 100 PPFD.

Crossover is another factor to take into account when planning a lighting layout for growing plants. The space where the light from two different sources of illumination converges is called this region. These are the angled photons that nonetheless provide benefits to the plants. Crossover is a crucial factor to take into account and can greatly raise PPFD levels. Light loss can be retrieved by calculating the distance between fixtures depending on the PPFD each light can produce. This results in fewer photons being lost and more helpful light for your plants.

Grow lights come in a wide variety of varieties on the market today. Some are more adept at evenly distributing energy than others.
 

Spot Light PAR30 Light Bulbs

Feature:

● 75 Watt replacement using only 11 Watts (850 lumens)
● Rated to last 22 years based on 3 hours per day use
● Saves 176 dollars on energy costs per bulb vs. 75-Watt incandescent over the bulb's life
● Dimmable and works with most dimmer switches

Specification: