SCP7TT78HPL1T0S06E vs SCP8QT78HPL1Q0S06E
| Part Number |
|
|
| Category | LED Lighting - White | LED Lighting - White |
| Manufacturer | Samsung Electro-Mechanics | Samsung Electro-Mechanics |
| Description | LED LM101A NEUT WHT 4000K 2SMD | LED LM101A COOL WHT 5700K 2SMD |
| Package | 0505 (1313 Metric) | 0505 (1313 Metric) |
| Series | LM101A | LM101A |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 0505 (1313 Metric) | 0505 (1313 Metric) |
| Supplier Device Package | SMD | SMD |
| Size / Dimension | 0.046" L x 0.046" W (1.18mm x 1.18mm) | 0.046" L x 0.046" W (1.18mm x 1.18mm) |
| Current - Max | 450mA | 450mA |
| Current - Test | 150mA | 150mA |
| Color | White, Neutral | White, Cool |
| Height - Seated (Max) | 0.017" (0.42mm) | 0.017" (0.42mm) |
| Voltage - Forward (Vf) (Typ) | 2.9V | 2.9V |
| Viewing Angle | 150° | 150° |
| Lumens/Watt @ Current - Test | 149 lm/W | 131 lm/W |
| CCT (K) | 4000K | 5700K |
| CRI (Color Rendering Index) | 70 | 80 |
| Flux @ 85°C, Current - Test | 65 lm (59 lm ~ 71 lm) | 57 lm (51 lm ~ 63 lm) |
-
1. What is the meaning of LED lighting?
LED lighting (Light-Emitting Diode Lighting) is a lighting technology that uses light-emitting diodes (LEDs) as light sources. LED lighting has the advantages of high efficiency and energy saving, long life, high brightness and environmental protection, so it is widely used in indoor and outdoor lighting.
The working principle of LED lighting
LED lighting is based on the principle of semiconductor light emission. When current passes through the LED chip, electrons and holes recombine in the semiconductor material, releasing energy in the form of light to form visible light. LED chips are usually composed of blue or purple light sources and corresponding phosphors. Through the luminescence conversion of phosphors, visible light of different colors can be produced.
Features of LED lighting
High efficiency and energy saving: LED chips can convert most of the electrical energy into visible light, and less energy into heat energy, so the energy consumption is low. Compared with traditional incandescent lamps, the energy efficiency of LED lighting is usually improved by more than 80%, effectively reducing the cost of electricity.
Long life: LED chips have high vibration resistance and vibration resistance, and are not easily affected by the external environment, so they have a long service life. Under normal circumstances, the life of LED lighting can reach tens of thousands of hours.
High brightness: LED lighting has high brightness and is suitable for various lighting needs.
Environmental protection: LED lighting does not contain harmful substances such as mercury and is environmentally friendly. -
2. What are the disadvantages of LED lights?
The main disadvantages of LED lights include heat dissipation problems, high cost, strong light directionality, limited color selection, and temperature sensitivity. LED lights need to solve the heat dissipation problem during the production process, because its heat management is an important challenge, which is usually handled by passive air cooling. In addition, the initial purchase cost of LED lights is high, mainly due to the advanced technology and materials used in its production process, but in the long run, its energy saving effect makes the return on investment still high.
The light of LED lights is highly directional, which may cause uneven lighting effects. To solve this problem, some lamps use special designs such as using multiple LED lamp beads or diffusers to provide more uniform lighting. In terms of color selection, although LED lights can emit a variety of colors, their selection is relatively limited because different semiconductor materials can only emit specific colors of light.
In actual applications, LED lights are sensitive to temperature, and their luminous efficiency and life may be reduced in high temperature environments. Therefore, care should be taken to avoid exposure to excessive temperatures during installation and use. In addition, LED lights require special drivers to provide constant current and voltage, which increases the complexity and cost of the system, but with the development of technology, integrated LED bulbs have reduced this complexity.
-
3. Is the LED positive or negative?
LED lights are divided into positive and negative poles. The positive and negative poles of LED lamps can be distinguished by the following methods:
Long pin: For plug-in LED lamps, the longer end of the pin is the positive pole, and the shorter end is the negative pole. In addition, when observing the inside of the LED lamp bead, the end with the smaller electrode is usually the positive pole, and the larger end is the negative pole.
SMD LED lamp beads: The positive and negative poles can be distinguished by the following methods:
Printed identifier: Check the printed identifier on the back of the SMD light-emitting diode board. Usually, one side of the "T" shape or inverted triangle symbol is the positive pole, and the other side is the negative pole.
Colored lines: Observe the printed lines of the SMD light-emitting diode board. The side with colored lines is usually the negative pole, and the other side is the positive pole.
Missing corner: Pay attention to the front panel of the SMD light-emitting diode. The missing corner is usually the positive pole and the other end is the negative pole.
Multimeter test: Use a multimeter to test. When the LED lamp bead is lit, the red test pen is connected to the positive pole and the black test pen is connected to the negative pole. -
4. How do LED lights work in physics?
The working principle of LED lights is based on the process of electrons and holes in semiconductor materials to produce photons. When current passes through the chip of the LED lamp, the electrons and holes inside the chip collide and recombine violently in the light-emitting layer to produce photons, which are the light we see. The core luminescent materials of LEDs are usually wide-bandgap semiconductor materials, such as GaN (gallium nitride), which have high luminous efficiency and good thermal conductivity.
Specific working process
Recombination of electrons and holes: When current passes through the PN junction of the LED, electrons and holes are pushed to the junction under the action of the electric field. When they meet, the energy level difference causes the electrons to jump from the high energy level to the low energy level, releasing energy in the form of light.
Emission of light: This process produces photons, which is the light we see. The color of the LED depends on the composition and structure of the semiconductor material used. For example, gallium nitride LEDs emit blue light, gallium phosphide LEDs emit red light, and green and yellow LEDs are achieved by changing the composition and structure of the material.
