How to solve the pressure difference inside and outside the LED outdoor lighting design difficulties?

OFweek semiconductor lighting network how to deal with pressure difference is still a hidden design difficulty, moisture and ventilation design can enhance reliability, prolonging the service life of the LED lamp.
Many commercial and residential lighting has been upgraded to LED light source, because the solid-state lighting (SSL) lighting can continue to transport more than 100000 hours of light, and it is the most environmentally friendly, reliable lighting solutions -- especially in outdoor lighting. However, the outdoor variety of application and the harsh environment, potential Water Leakage will cause the lamp faults and failure. Although the product development personnel can be sealed lamps, the lamp isolation and environment, but the lamp inside and outside air to be ignored pressure difference may cause a lot of problems. Let us to discuss the problem of pressure, consider this problem is eliminated by the methods of mechanical design, so as to ensure the service life of lamps and lanterns.

LED lamp benefits be too numerous to enumerate. In addition to the previously mentioned long life, solid-state lighting products also completely satisfy the restriction of hazardous substances (RoHS) regulations, than traditional lighting technology to save energy consumption up to 85%.

Although LED itself can be used continuously for more than 20 years, but only in the life cycle of electronic components, and a power supply with the support of the drive power and the whole lamp like LED is reliable and durable for the entire lighting system can provide value-added. The harsh conditions all components of lamp must be able to withstand the local environment, whether it is a Caribbean tropical climate or Alaska cold.

The harsh environmental challenge according to a study by RTI International, the main reason LED lamp faults is driving power supply problems, such as capacitors and interconnect fault, voltage, water or other chemicals invasion.

The driving power of traditional has a five year warranty period, but the experimental results show that these driving power of the high rate of fault. Reliability problems usually by affected by environmental conditions and damage to the sealing ring, and the connecting point of induced joint.

The durability of reinforced the lamp shell most engineers usually adopt the following three ways, the protection of drive power supply and electronic components: the seal or gasket more durable to improve the seal; the increase of shell thickness to reduce the casing of a mobile sealing ring around; and / or on the sealing ring or gasket is installed around the more screws to keep sealed more lasting effect the.
However, even with these measures, seal leakage, invaded by water, and ultimately the formation of condensation in the lens and reflector.

This happens often, this is because the whole lamp sealing will make lamps can't handle the pressure fluctuations, whether it is a positive pressure or negative pressure (or vacuum). When the pressure fluctuations, on the sealing ring and other connections to form larger stress, thus affecting the sealing effect. With the passage of time, the expansion seal frequent and contraction can make the weak point of the sealing ring failure, loss of sealing effect thereby, make water, dust and pollutants enter the lamp, lead to corrosion, short circuit or electronic component failure potential.

Temperature change, whether internal or external, internal and external change together, is one of the most common causes of pressure difference. The external temperature changes may be very severe (for example in the hot summer rainstorm), may also with the seasons and more smooth variation. Every day to night temperature up to drop 10 to 20 degree C, while the seasonal temperature difference between summer and winter can reach 40 degrees above C.

When the temperature increases, the lamp of the expansion of air, positive pressure of sealing ring, joint and connection point. When the temperature falls, the internal air shrinkage and the formation of a vacuum, again resulting in pressure on the seal.

The change of temperature 30 degrees C will cause about 10% of air inflow or outflow lamp.

For lamps of different size, the rapid decline in external temperature can cause the lamp inside the 0.5psi (35mbar) or higher vacuum. Vacuum, water, dust and pollutants will enter the shell. In good time, but will accelerate corrosion; but in severe cases, can be catastrophic failure. Corrosion can damage contained within the LED lamp, wire and cable, and other electronic components, and eventually shorten the life of lamps.