Basic knowledge of DOB testing technology

The main representation is the overall dimensions of the specifications: 35mm * 28mm, 50mm * 50mm, LED sizes are different, and the power is also different. In the application of SMD, LED 3528 has no advantages in brightness or lifespan compared to LED 5050, with different sizes.

Basic knowledge of LED bulb lamp testing technology

Forward voltage: The voltage drop generated between the two poles when the positive current passing through the LED is a certain value.

The current flowing through the LED when the reverse voltage applied to both ends of the LED is a fixed value.

[Peak wavelength] The wavelength with high spectral radiation power.

Half intensity angle: In the distribution of luminous (or radiation) intensity, the angle formed by the luminous (or radiation) intensity being greater than or equal to half of the greater intensity.

Any color can be seen as a color that is matched by mixing a certain spectral color with a reference light source (such as CIE standard light source a, b, c, etc., isokinetic light source e, standard illumination body d65, etc.) in a certain proportion. This spectral color is the main wavelength of the color. The main wavelength of a color corresponds to the hue (psychological quantity) of the color observed by the human eye. If the chromaticity coordinates of the tested LED device have been obtained, the equal energy white light source E (x0=0.333314, y0=0.333288) can be used as the reference light source to calculate the main wavelength that determines the color. When calculating, connecting based on different chromaticity maps can refer to the slope of the line passing through the chromaticity points of the light source and the sample, and read the intersection point between a line and the spectral development trajectory by looking up the table to determine the main wavelength.

Bulb lamp

Average intensity: The luminous flux d of a light source in a very small solid angle component in a given direction φ V and solid angle d ω  The ratio is (cd)

The wavelength interval at which the spectral radiation power is greater than or equal to half the maximum value.

2. What are the uses of 3528 and 5050 SMD LEDs?

Both 3528 and 5050 are finished lamp sizes in SMD surface mount LED packaging. Names divided by size.

Compared with the inline dip lamp, the surface mounted SMD lamp has a lower brightness, but it is easy to maintain and has a larger viewing angle. So almost all indoor LED displays are made of SMD chip LEDs

LED soft light strip 5050

5050 is a model for LED packaging. Named according to size specifications. It refers to the 5050 model LED lamp beads.

What does it mean to be compatible with piranha 02.03.04? What is SMD?

The high-power piranha is composed of SMD chips, and 02.03.04 is the model of the LED bracket.

The abbreviation for Surface Mounted Devices means that SMD is the unified model of a product. For example, both top and chip can be referred to as SMD, which means they belong to planar packaging.

SMD chips are a bit general, using chips packaged with 5050 or 3528 chips to make piranha.

Of course, there are many different chip sizes. The commonly used sizes for SMD range from 7 9mil to 24 10mil.

High power refers to a voltage exceeding 0.5W, which can be called high power.