How to adjust the brightness and color temperature of LED desk lamp?
Generally, it is regulated by PWM signal. From the circuit level, APC chip can be used to generate complementary PWM signal to adjust color temperature and brightness. The following picture is a light strip dimming and color adjusting circuit. The potentiometer adjusts the APC chip GP9303 to generate PWM.
Led tone temperature is to change the proportion of different light. Increase the red light, warm the color temperature, increase the blue light, cool the color temperature. Adjust the brightness, change the current through the LED, the larger the current, the brighter. On the contrary, it is darker. The regulation of current is realized by changing PWM. The so-called PWM is the pulse width adjustment.
First of all, the tone temperature we are talking about is aimed at white light, and there are two main ways to obtain white light at present, one is blue light is excited by phosphor, the other is mixed light of three primary colors. At present, the white light of LED light strip is basically obtained by three-chip mixed light.
First: this dimming method is to modulate the LED driving current to complete the dimming of the LED lamp. Because the brightness of the LED chip is proportional to the LED driving current, we can control the light and shade of the LED lamp by adjusting the LED driving current. Second: this dimming method is called imitation dimming method or linear dimming method.
Light-emitting diode RGB tricolor lamp bead principle?
1. The principle of luminescence is designed and determined To put it popularly, its color mixing mode is like red, green and blue lamps. When their lights overlap each other, the colors are mixed, but the brightness is equal to the sum of the two luminances. The more they mix, the higher the brightness, that is, additive mixing.
2. The color change of led lamp beads uses the principle of three primary colors (red, green and blue). Because human vision is the most sensitive to these three colors, many visible lights are mixed with red, green and blue in different proportions. The same monochromatic light can also be divided into these three kinds of light.
3. Generally, the effect of flow lamp is made of RGB tricolor lamp beads. If they are connected in series or in parallel, they can only control the brightness or dimming. In order to produce the racing lantern effect, each segment must be controlled by an IC, so the racing lantern is removed.Positive and negative contacts, there is also a signal line..Color temperature adjustable lamp bead principle.
4. The characteristics of tricolor light-emitting diodes: multi-color, good display effect, energy saving and environmental protection, convenient control, wide application and other advantages, high cost. Can emit a variety of colors: RGBLED can emit red, green, blue three different colors of light, through the mixing of different colors of light can get a variety of different colors of light.
5. The three primary colors refer to red, green and blue. Human eyes are most sensitive to red, green and blue. Most colors can be synthesized according to different proportions of red, green and blue. Similarly, the vast majority of monochromatic light can also be divided into red, green and blue.
I bought lamps and lanterns LED bulb lamp, he introduced to me that you can adjust the color temperature in different seasons, who knows.
In fact, there is only one DC interface to connect the adapter. Then three wiring mats are used to connect the positive and warm white positive poles and their respective negative poles.
First: this dimming method is to modulate the LED driving current to complete the dimming of the LED lamp. Because the brightness of the LED chip is proportional to the LED driving current, we can control the light and shade of the LED lamp by adjusting the LED driving current. Second: this dimming method is called imitation dimming method or linear dimming method.
Monochrome can not be adjusted, tricolor can be adjusted by adjusting the ratio of red, green and blue to adjust the color temperature. The color temperature that most people feel comfortable is about 6800K, which is basically similar to the noon sun.
Yes, you can use the combination of lamp beads with different color temperature to adjust the current of the lamp bead and make the lamp with variable color temperature. I have seen a Lehman color temperature adjustable lamp bead principle in this forum before, similar to this, he is in a lamp bead fixed blue light red light two chips, adjust the current of the red light chip can adjust the color temperature.
In general, the color temperature of warm colors is about 3000. The color temperature of positive white light of fluorescent lamp is about 6500-7000. Stepless brightness, which is different from segmented dimming, refers to several fixed modes. For example, there are only three modes for brightest, moderately bright and small night lights, and you can only choose among these three modes.
Dimming LED ceiling lamp, in fact, there are 2 channels of internal output. All the way is warm light (about 3000k color temperature), all the way is cold light (straight white, 7000k color temperature). Each road is independent. By giving different brightness to each way, the color temperature and brightness of the whole lamp can be adjusted.
How does the LED lamp bead change color?
The principle of three primary colors is adopted. LED lamp uses white (including cold white and warm white and other lighting white light), red, green, blue (R, G, B) four basic colors LED lamp bead chip These lamp bead chips are packaged in many forms Each group of colors can be used separately And are respectively connected with the drive circuit and the single-chip microcomputer.
The principle of changing Light of LED Lamp Color temperature adjustable lamp bead principle The LED light source uses the tricolor principle of red, green and blue to form extremely rich colors according to different grayscale. Human eyes are most sensitive to red, green and blue, and most colors can be synthesized according to different proportions of red, green and blue.
The optical principle of led discoloration lamp is composed of red (R), green (G) and blue (B) LED. It is generally composed of red light LED and green light LED. It can emit red or green light alone. If the red light and green light are bright at the same time, the red and green light will be mixed into orange and yellow.
The specific principle is that a variety of LED lamp beads of different colors are installed on the lamp holder, and the light color is changed by changing the gear through the action of turning on and off.
The color of LED lights is controlled by computer. LED light source can make use of the principle of red, green and blue to make the three colors have 256grayscale and mix arbitrarily under the control of computer technology, then 256X256X256 (i.e. 16777216) colors can be produced and different light color combinations can be formed.
Which one is better to choose an adjustable strip light source?
Opal Lighting, Rex, Philips, Yimei Lighting, Sidon Lighting The bar lights and panel lights are done very professionally. Among them, Sidon and Yimei lighting are slightly higher in positioning and quality. There are more styles and customized functions to adapt to the high-end and personalized market.
Some people will also choose strip wall lamp at home, because the decorative function of strip wall lamp is stronger, and the range of lamp illumination is relatively wide. The lighting effect of the strip wall lamp is relatively good, because the use of the strip design, so the light source is relatively wide.
Bold, very easy to use, good uniformity, large irradiation area, the angle of exposure can also be adjusted, the performance-to-price ratio is quite good.
ZQA-3000W uses ultra-high quality materials with high instantaneous brightness and good stability. In the specified size area, the instantaneous brightness above 1000000Lux can be achieved. The product can be lit for more than 10 times without attenuation. ZQA-3000W uses unique technology, which can instantly brighten up to more than ten times that of ordinary light sources.
The principle of adjusting Color temperature and brightness by led
The principle of LED dimmer has three kinds of wave width controlled dimming (Pulse Width Modulation, referred to as PWM) to digitize the square wave of the power supply and control the duty cycle of the square wave so as to achieve the purpose of controlling the current. Constant current power supply regulation can easily adjust the current by using analog linear technology.
Definition of color temperature: when an object is heated to a high temperature, it glows, the hot iron is red, and the burning magnesium shines white (the flash used in early photography was to ignite magnesium powder).
Blue LED excites yellow phosphor to produce white light LED excites RGB (red, green, blue) three-wavelength phosphor to produce white light. Red LED, green LED and blue LED are directly mixed to produce white light. If the color temperature can be adjusted, it should be the third LED mentioned above.
Generally, it is regulated by PWM signal. From the circuit level, APC chip can be used to generate complementary PWM signal to adjust color temperature and brightness. The following picture is a light strip dimming and color adjusting circuit. The potentiometer adjusts the APC chip GP9303 to generate PWM.
