The lamps that have just been used do not light up? Which link is the problem?

According to common sense, the lights that have just been used are basically not bright, but this phenomenon is not a few, why? Exclude the line problem of the electricity environment, it may be that the quality of the lamp itself is not good, consumers can judge the quality of the lamp according to the following aspects, from the source to avoid the problem of short life of the lamp.

power supply drive

LED power supply, also called drive, the main function is to provide constant voltage and constant current source for LED lamp beads. Through the constant current way to avoid the driving current exceeds the maximum rating, so as to ensure that the LED lamp to achieve the expected brightness, color temperature requirements, stable constant current input and output more effectively extend the life of the lamp.

Especially when dimming of lamps is required, it is difficult to maintain the consistency of light brightness. A small increase in voltage will cause an exponential increase in current. If it is not adjusted properly, it can sometimes damage the LED lamp. In addition, in the constant current circuit, the heat generated inside or outside of the element itself causes a bias, which lowers the forward resistance (reduces the voltage difference) and increases the current through the device, which improves the reliability of the LED lamp for a long time.

Inferior drivers are basically equal to no protection against surges, voltages, etc., allowing the lamp beads to work in extreme conditions. Lamps may dim, flicker, or even not be bright soon after use, and even more serious safety hazards of board explosion may occur.

lamp bead

lamp bead is the chip of LED, just like the brain of lamp. Some chips use new conversion technology to produce ultra-thin conversion layer, which can withstand higher junction temperature and longer heat dissipation. Because the LED work process continues to heat, if the heat can not be quickly dissipated, LED lamp beads at high temperatures will be a sharp decline in light, life greatly shortened.

LED industry has a life certification called LM80, which ensures that the brightness of lamp beads can drop by no more than 30% within 33000 hours. Your home is lit for 5 hours a day, almost 20 years, which is enough to use. Therefore, the service life of lamps and lanterns with high quality lamp beads will be longer.

Heat dissipation structure process

The heat dissipation of the lamp will directly affect the service life of the lamp beads. The heat dissipation of the hot air flow and the air convection form a high-speed cycle to ensure the most stable working state of the lamp.

The heat source of LED lighting mainly comes from two parts: light source and power supply. The heat of the light source part usually pays attention to the effective contact area between the bonding surface of the light source PCB and the heat sink. The larger the effective contact area, the better the heat dissipation. In addition, it should be noted that the thermal conduction interface between different media is as smooth as possible. The fit between the heat transfer objects should be tight enough, and the contact surface gap of the fitting parts should be as small and small as possible. The natural convection heat dissipation mode of

LED lamps also requires the effective heat dissipation area. Therefore, in general, the outer wall of the heat sink can be appropriately roughened to increase the effective heat exchange area. In addition, when spraying different color paints, the spraying thickness and the thermal conductivity and thermal radiation performance of such color paints should be considered.