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Shanghai Ceyuan Industrial (SCI) Ltd.

ADD:Room 901, No.20, Lane777, West Guangfu Road, Putuo District, Shanghai, China. 

Contact: Ellie Wang

TEL: +86-573-82753308

Mobile: +8618042017693

FAX: +86-573-82753302

E-mail: elliewangled@chinacytech.com

Website: www.cyledlight.com


Outdoor LED Fixtures Extremely Critical

Outdoor lighting need to withstand long-term snow and ice, wind and rain lightning test, and the higher cost, and because the use of more difficult to repair on the external walls, Outdoor LED Fixtures to meet the requirements of long-term stable work. The LED is a delicate semiconductor components, if the damp, there will be chip moisture absorption, damage to the LED, PcB and other components, Outdoor LED Fixtures therefore, LED suitable for work in dry and low temperature. To ensure that the LED in the harsh outdoor conditions, Outdoor LED Fixtures long-term stable work, lighting waterproof structure design is critical.

At present, the lamp waterproofing technology is divided into two directions: structural waterproof and waterproof material. The so-called structural waterproof, that is, in the product after the combination of structural components, already have a waterproof function. Outdoor LED Fixtures The material waterproof, it is the product design, leaving the potted plastic sealed electrical components of the location, Outdoor LED Fixtures assembly with glue material to achieve water. Two waterproof design are suitable for different product lines, each have their own advantages

UV radiation on the outside of the lamp insulation layer, the shell protective coating, plastic parts, potting, sealing rubber tape, adhesive has a damaging effect.

After the wire insulation layer is cracked, Outdoor LED Fixtures the water vapor penetrates into the interior of the lamp through the gap of the wire core. After the lamp shell coating aging, Outdoor LED Fixtures the edge of the shell coating crack or peeling, there will be gaps. After the plastic shell is aged, it will crack. Electronic potting colloid aging will produce cracking. Seal rubber tape aging deformation, there will be gaps. Structural adhesive between the adhesive aging, reduce the adhesion will appear after the gap. Outdoor LED Fixtures These are UV damage to the lamp waterproof ability.

Outdoor daily temperature changes in the summer daytime lighting surface temperature can rise to 50 ~ 60 ℃, late to 10 ~ 20 qC, winter ice and snow days can be reduced to zero, the annual temperature difference is greater. Outdoor lighting in the summer high temperature environment, Outdoor LED Fixtures the material accelerated aging deformation. When the temperature drops to minus, the plastic parts become brittle, Outdoor LED Fixtures under the pressure of snow or cracking.

Lamp shell thermal expansion and contraction: changes in temperature lead to thermal expansion and contraction of lamps, different materials (such as glass and aluminum) coefficient of linear expansion of the two materials in the junction will appear displacement. Thermal expansion and contraction process repeated, Outdoor LED Fixtures Outdoor LED Fixtures the relative displacement is also repeated, great damage to the airtight lighting.

The internal air thermal expansion and contraction: the ground floor can often be observed on the ground floor of the glass of water droplets condensation, Outdoor LED Fixtures and how to infiltrate the water droplets filled with potting lamps inside it? This is the result of the thermal expansion and contraction of breathing.

For example, when the temperature from 60 ℃ down to 10 ℃, Outdoor LED Fixtures the lamp internal pressure change is about: 1 a (273 +60) K / (273 +10) K = a 0.18 atm = 1.86 m water column

The temperature rises, under the action of the huge negative pressure, the humid air passes through the tiny gap on the material of the lamp body, penetrates into the lamp body, encounters the lower temperature lamp shell, condenses into the water droplets and gathers. Outdoor LED Fixtures After the temperature decreases, under the action of positive pressure, the air is discharged from the lamp body,Outdoor LED Fixtures  but the water droplets are still attached to the lamp. Repeated temperature changes in the daily breathing process, more and more water inside the lamp.

Thermal expansion and contraction of the physical changes, so that outdoor LED lighting waterproof design of the gas system into a complex system. The following two types of lighting waterproof system technical characteristics of the analysis, in order to understand its advantages and disadvantages.


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