# LED Grow light Pearl Quantum Efficiency QE Value And MQE Value Parameter

This paper provides the main parameters of LED plant lamp beads – the limit value, current value and minimum value of QE value and MQE value of light quantum efficiency. The purpose is to provide a reference range for the industry and provide technical parameters for the design and application of plant lights.

This parameter is calculated using a spectral level algorithm.

1. The significance of the specification of the lamp quantum efficiency parameter

With the development of LED chip technology and packaging technology, the quantum efficiency of lamp beads for plant lamps is continuously improved. The average QE value of the main lamp beads required for plant lamp spectrum design is above 1.8umol/J, and the quality QE value of lamp beads is up to 2.1umol/J or more provides a wider range of applications for LED plant lights.

For plant lamp designers and users, it is necessary to scientifically understand the application range and limit value and minimum value of this parameter value, especially in practical applications, it is necessary to avoid using products below the minimum QE.

Judging from the current industry situation, the existence of virtual standard parameters and excessive standard parameters is not conducive to the development of the industry. The proposed specifications are conducive to the healthy development of LED plant lights.

2. Reliability of LED lamp quantum efficiency parameters

The photon efficiency QE value and MQE value of the lamp bead are a major performance parameter that is not related to the measurement technology. It is the main means to test the performance of the LED plant lamp. The parameter algorithm has passed the spectral level test with an error of less than 0.1%. Through the calculation of hundreds of lamp bead data, after 5 months of completion, the parameters are highly reliable, the algorithm is accurate, and the spectral level algorithm is valid, which fully reflects the scientific nature of the parameters.

3. Key terms and definitions

Quantum Efficiency (QE), which means that the artificial radiation source is in the range of 400-700 nm, and the energy per square joule is converted into the quantum quantity. QE is related to the radiation efficiency and wavelength. The higher the QE value, the radiation source to the photon. The stronger the conversion capability, the higher the efficiency of power utilization. Unit: μmol/J Photon Energy Efficiency QE Calculation:

QE=PPF/w where: w is the power consumption of the radiation source, unit: watt

QE is suitable for lamps, light sources, and lamps.

Note: The QE value has the problem that the SPD green component content is large and the efficiency is distorted. It needs to be based on the comparison under the same light quality.

Measurement range of quantum energy efficiency Measured Quantum Efficiency (MQE)

Indicates the ability of an artificial radiation source to convert into energy quantum number per jerk in the range of 380-800 nm. MQE is related to radiation efficiency and wavelength. The higher the MQE value, the stronger the conversion ability of the radiation source to the optical quantum. The efficiency is higher. Unit: μmol/J

Measurement range of quantum energy efficiency MQE calculation formula:

MQE=MPF/w where: w is the power consumption of the radiation source, unit: watt

Suitable objects for MQE are lamp beads, light sources, and lamps.

Note: The MQE value has the problem that the SPD green component content is large and the efficiency is distorted. It needs to be based on the comparison under the same light quality.

Limit value The quantum efficiency value after the theoretical limit of the radiation efficiency achievable in the spectral form of the LED lamp bead is the theoretical limit value.

The current value The current range of LED chip technology and LED packaging technology can reach.

Lowest value The light quantum efficiency of the LED lamp bead is lower than this value, indicating that the lamp bead is too energy-intensive and is not suitable for use in plant lamp manufacturing.

monochromatic light With a certain wavelength as the peak, the spectral shape is a monochromatic light bead with an attenuation distribution on both sides of the peak.

White light For the purpose of illumination, the color temperature is between 2500K-8000K, the LED lamp bead spectrum is continuous spectrum, and the package does not add red light chip.

Blue light-excited composite light For the purpose of planting process spectroscopy requirements, the LED lamp bead spectrum is continuous spectrum or non-continuous spectrum, and the package is not added with red light chip.

4. the standard specification of commonly used lamp beads

Wavelength 390nm﻿

 Limit value QE= — MQE= 1.63 μ mol/J The current value QE= — MQE= 0.39-0.95 μ mol/J Lowest value QE= — MQE= 0.36 μ mol/J

Note: The wavelength of the 390 nm spectrum spans to the 400 nm range and the amount of radiation is extremely small. The QE value of this part is not calculated.

Wavelength 445nm﻿

 Limit value QE= 2.60 μ mol/J MQE= 2.60 μ mol/J The current value QE= 1.30-2.04 μ mol/J MQE= 1.30-2.04 μ mol/J Lowest value QE= 1.12 μ mol/J MQE= 1.12 μ mol/J

Wavelength 595nm

 Limit value QE= 2.38 μ mol/J MQE= 2.38 μ mol/J The current value QE= 0.74-1.49 μ mol/J MQE= 0.74-1.49 μ mol/J Lowest value QE= 0.55 μ mol/J MQE= 0.55 μ mol/J

Wavelength 640nm

 Limit value QE= 3.47 μ mol/J MQE= 3.47 μ mol/J The current value QE= 1.49-2.56 μ mol/J MQE= 1.49-2.56 μ mol/J Lowest value QE= 1.23 μ mol/J MQE= 1.23 μ mol/J

Wavelength 660nm

 Limit value QE= 3.86 μ mol/J MQE= 3.86 μ mol/J The current value QE= 1.65-2.75 μ mol/J MQE= 1.65-2.75 μ mol/J Lowest value QE= 1.54 μ mol/J MQE= 1.54 μ mol/J

Wavelength 735nm

 Limit value QE= — MQE= 3.68 μ mol/J The current value QE= — MQE= 1.53-2.82 μ mol/J Lowest value QE= — MQE= 1.35 μ mol/J

Note: The spectrum at wavelength 730nm is outside the 700nm band limit, and the amount of radiation in the PAR interval is extremely small, and the QE value is not calculated.

White 4100K

 Limit value QE= 2.49 μ mol/J MQE= 2.61 μ mol/J The current value QE= 1.13-2.17 μ mol/J MQE= 1.18-2.2 μ mol/J Lowest value QE= 1.04 μ mol/J MQE= 1.09 μ mol/J

Note: The color temperature index of this color temperature Ra=70-85 range.

White 6100K

 Limit value QE= 2.56 μ mol/J MQE= 2.62 μ mol/J The current value QE= 1.10-2.12 μ mol/J MQE= 1.13-2.17 μ mol/J Lowest value QE= 1.01 μ mol/J MQE= 1.04 μ mol/J

Note: The color temperature index of this color temperature is Ra=70-80 range.

Parameter specifications for other wavelengths will be released in subsequent WeChat public accounts.

5. Application of parameter specifications

This parameter is applicable to plant plant design, greenhouse fill light, user parameter validation, LED package company’s parameter specification and reference of relevant research institutions.