Stroboscopic has a great impact on the working state of the visual system, and no stroboscopic scheme can ensure healthy lighting. Now more and more studies report the harm of stroboscopic:

It may cause brain cell damage - some researchers said that by observing the EEG, they found that even though the stroboscopic light in the environment is too fast for people to detect, the retina of the organism can still distinguish and react to light with a frequency of 100-160 Hz, or even up to 200 Hz. In animal experiments represented by cats, 100-120 Hz light has caused brain cell burns, and the burned cells belong to the lateral geniculate body tissue, This tissue controls the eyeball.

It may affect reading and vision, and induce migraine - some studies have shown that the brightness stroboscopic of fluorescent lamp and CRT display screen will affect the eye movement track when reading text. In addition, it is also found in some health examination reports that the visual impairment is caused by fluorescent lamp stroboscopic. The experiment found that the frequency of 100Hz fluorescent lamp stroboscopic may double the incidence rate of headache of office workers. Of course, this effect is usually considered as a special case and only occurs in special populations.

Reduce work efficiency and cause work-related injuries - in light industry, food, printing, electronics, textiles and other industries, lighting fields that generally use straight tube fluorescent lamps, such as assembly lines, visual fatigue and migraine caused by stroboscopic will cause problems such as difficult positioning and low production efficiency; In the mechanical industry, such as crane operators, visual fatigue caused by stroboscopic will cause positioning difficulties, operational errors, and even accidents; When the speed of a moving object is a multiple of the stroboscopic frequency of the light source, the moving state of the moving object will produce periodic repeated false vision of three states: static, reverse, and slow moving, which is easy to cause industrial accidents.

Constant current scheme with high PF value, high efficiency and high power; Reduce the program cost, improve the light efficiency of the whole machine, extend the product life, and bring benefits to users!

 Benefits of high PF 

It can reduce reactive current, reduce line loss and improve power supply quality

For example: compare the 400W product with a PF value of 0.95 with the 400W product with a PF value of 0.5

For 400W products with a PF value of 0.5, the input current under 230V50HZ of the power grid is 3.478A, so the ratio of reactive current and active current is 1-0.5/0.5 respectively, that is, the reactive current is 3.478A * 0.5=1.739A. The reactive current does not let the power drive LED to light up in the loop, but does reactive power in the transmission path to increase the heat loss in the circuit. The reactive power of the power grid is about 230V * 1.739=400W, that is, the 400W power supply with a PF value of 0.5, The reactive part of the circuit is 400W running in the circuit, which causes the circuit to heat up. The new meter billing method will count the power consumption of this part, charge it, and increase the user's additional costs.

What about the 400W product with a PF value of 0.95? Under the condition of 230V50HZ of the power grid, the input current is 1.83A, and the ratio of reactive current and active current is 1-0.95/0.95, that is, 0.05/0.95, respectively. The calculated reactive current is 1.83A * 0.05=0.0915A, and the reactive power of the power grid is approximately equal to 230V * 0.0915=21W. The ratio of reactive power of 400W power supply with a PF value of 0.95 to reactive power of 400W power supply with a PF value of 0.5 is 21W/400W * 100%=5.25%. The effect of using high PF is clear at a glance.

 Benefits of efficiency 

It can reduce the heat loss of the product itself, transfer energy into light energy with high efficiency, improve product life, and reduce user costs

For example: conversion efficiency 85% VS conversion efficiency 93%

Taking the power supply of a phototherapy system successfully imported by Reasunos as an example, when the total power of the driving power supply is 6000W and the conversion efficiency of the driving power supply is 85%, then the power used to transmit light is 6000W * 85%=5100W, and the heating power of the system is 6000W-5100W=900W. When the conversion efficiency of the driving power supply is 93%, the power transmitted for light emission is 6000W * 93%=5580W, and the power generated by the system is 6000W-5580W=420W. The luminous power increases: 5580W-5100W=480W, that is, under the same luminous power, the cost can be reduced by 9% with high efficiency; The heating part of the system is reduced to 420/900=46%, which is 54% less than the original one. The cost of the cooling part can be reduced by 50%, and the service life of the product can be doubled.

 The original scheme adopts the constant voltage scheme VS the current constant current scheme 

The original constant voltage scheme will increase the cost of light source production. A current limiting resistor will be added to each string of lamp beads to ensure that the current will not exceed the current specification value of the lamp beads. The disadvantages here are: adding a current limiting resistor will increase the cost, while the light source plate design of the constant current scheme does not require a current limiting resistor, which is an additional cost; Increasing the current limiting resistance will increase the heat loss and reduce the luminous power of the light source, while the output power of the constant current scheme is emitted in light energy to obtain the desired light intensity.

When using lights with different colors and voltages, the loss of the constant voltage scheme is more obvious. For example, the voltage of a string of lamp beads is 48V, and the voltage of a string of lamp beads is 40V, which is driven by a 48V constant voltage power supply. For a string of lamp beads with a voltage of 40V, 48V-40V=8V is consumed by resistance, and the loss ratio is 8/48 * 100%=16.7%. If a constant current source is used to drive, the 16.7% loss can be eliminated.

Conclusion: From the above health lighting scheme, to avoid stroboscopic hazards, as well as the advantages of high PF, high efficiency and constant current scheme, so as to bring benefits to users and reduce system costs, combined with the general trend of energy conservation and emission reduction, the introduction of Reasunos's scheme into the phototherapy system is a beginning, a starting point. I believe that more industries will introduce our excellent scheme!