According to Cornelissen, incandescent lamps usually show a warm color when the light is dimmed. According to the laws of the human body, when the light is dimmed, people generally prefer red light. LED lights generally do not change color as the light intensity changes. There have been research teams trying to use colorful LEDs and control circuits to make LED lights turn red as power gets smaller. But this method also has its drawbacks: multiple components increase the cost of the fixture and the risk of damage, and the mixed light from multiple LEDs can cause color shading.
LED (Coated) and ordinary LED (Reference) wrapped with new materials
The research team's approach is completely different. They apply textile materials or transparent materials on the LED surface, and the color of the light changes. They first started experimenting with cool white LEDs, because white LEDs are made of blue LEDs plus phosphors, and some of the blue light is absorbed by the phosphors to emit light of other colors, and the two light rays are mixed into white light. They believe that if the blue light absorbed by the phosphor becomes more, the mixed white light will become warmer, and what they do is to use innovative methods to achieve this transformation.
The researchers made a coating of a mixture of liquid crystals and polymer materials. This mixture typically scatters light, but when the temperature reaches above 48 ° C, the liquid crystal molecules will rearrange and the coating of the mixture will become transparent.
The mixture is coated with the LED and the power is increased. The temperature rise causes the coating to become transparent, and the LED emits cool white light. When the power is reduced, the coating molecules recombine into a scattering material, which will bounce more blue light. Into the phosphor, the LED will emit warmer warm white light. The scientists fine-tuned the LED design and used a variety of phosphors to make the light meet industry lighting standards.
Cornelissen said: "This LED lamp may have to wait two years to go public. After all, we need time to prove its reliability. This is very important." The research team believes that this new LED lamp can accelerate the recognition of LED technology. And acceptance, especially in the home lighting and hotel lighting markets, there is a need for comfortable and warm light.
Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.
The maximum synchronous transmission rate of the original SCSI standard was 5MB / S (scsi-1, also known as narrowscsi, in 1986, the maximum support for seven devices, the clock frequency was 5MHz), and the later SCSI II specified two options for increasing the speed. One is to increase the frequency of data transmission, namely fast SCSI (in 1994, the maximum support for 7 devices) is 10 Mb / S (10 MHz) because the frequency is doubled; the other is to double the transmission frequency and increase the width of the data path from 8 bits to 16 bits. The maximum synchronous transmission speed of widescsi is 20MB / S (the clock frequency is 10MHz, in 1996, the maximum support for 15 devices).
The third generation of SCSI appeared around 1995, but there was no unified standard
1. Ultra SCSI with maximum synchronous transmission speed of 20MB / S (also known as FAST-20 SCSI, clock frequency of 20MHz);
2. Ultra wide SCSI with maximum synchronous transmission speed of 40MB / S (same as 1);
3. Ultra2 SCSI with maximum synchronous transmission speed of 40MB / S (also known as fast-40 SCSI, clock frequency of 40MHz, 1997).
Later, some newer SCSI standards appeared
1. Ultra2 widescsi with maxmum synchronous transmission speed of 80mb / S (clock frequency of 40MHz);
2. Ultra 3 SCSI with maximum synchronous transmission speed of 160MB / S (also known as ultra-160 or fast-80 wide SCSI, clock frequency of 40MHz plus double data rate, 1999);
3. Ultra 320 SCSI with maximum synchronous transmission speed of 320mb / S (also known as ultra 4 SCSI, clock frequency of 80MHz plus double data rate, 2002); 4. Ultra 640 SCSI with maximum synchronous transmission speed of 640MB / S (clock frequency of 160MHz plus double data rate, 2003, is the latest SCSI standard)
This interface is a convenient interface standard for system integration, cost reduction and efficiency improvement. More and more devices will use the SCSI interface standard. Therefore, there are many hard disks and SCSI CD-ROM drives with SCSI interface. However, due to the cost problem, they are mainly used on medium and high-end servers and workstations.
Metal Male SCSI Cover Section
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