First of all, the main part of the main guardrail tube: lamp beads

Reasons for the price difference of LED display: Lamp beads:

Commonly used in the market, the price of the lamp beads with better brightness and light decay control is analyzed from the perspective of 0.36-0.43 yuan/group of RGB and low price of 0.2/group of RGBLED applications: 1. The former has high brightness, long life, long light decay and small color mixing effect. The good dead light rate is low, but the latter has low brightness, short life, obvious light decay and uneven color mixing (conclusion after 50 mA current impact test). The price difference of each guardrail tube between the two in application is 7-8 Around yuan.

Reasons for the price difference of LED display: circuit board:

Circuit board: What is the difference between wave fiber and half wave fiber flame retardant paperboard?

Wave-fiber board: The flexibility is not easy to break, the original device is little damaged, the life is long, the copper skin is thick, and the overcurrent is large.

Cardboard: On the contrary, if there is strong vibration during transportation or installation, the board may be broken, and the copper skin is thin. It is easy to cause the copper skin to drop in the tin, and it will even corrode when there is water vapor in the tube for a long time. Then the circuit board can save 0.5-1.2 yuan.

Safety wire: Whether it is necessary or not. Many people are now arguing about it. Of course, it is always good to add it. Of course, the overcurrent is relatively large. If it is 220V, it should not be a problem with a 15-meter connector. If you don’t add it You can save 0.6 yuan.

Electronic components: almost all the same

Tin: The real culprit of false soldering is 40 degrees -55 degrees. The price difference is 10-15 pieces/kg. It can be seen from the circuit board. The good ones are of course brighter. The 40 degrees is easier to fall off and cause false soldering. Not all of them can be seen, but the bright time is long. When you find that the guardrail tube you purchased has a small color difference, then the murderer is right in front of you. The average is about 0.5 yuan per meter.

Next is the PC tube. Of course, there are both the first material and the secondary material or even the PC tube of the third material. Generally, the phenomenon of tube burst in the market should be related to this material, and of course it is also related to the paint water. If you use it If the tube used to wipe the secondary or tertiary material does not explode for a long time, there should be very little phenomenon. Generally, industrial alcohol is used, so that there will be no chemical reaction. The price of one-time and three-time materials

Waterproof: Nowadays, many manufacturers use resin in the plugs, of course, they also use silica gel. Of course, the hardness of silica gel is not enough. In the actual installation of the project, if you string it and connect it, then pull it up. It is possible to pull out or loosen the wire during installation,

The plug is fixed, and hot melt silicone is used by people. The cost of using silicone inside and outside of a tube should be around 1.5-2 yuan, but if the hot melt glue is used inside, the cost should be around 0.7-1 yuan, then we It saves 1 yuan again, so what's the difference? Bad weather will prove that the hot melt adhesive-no, our company put the sealed tube in the freezer for three days and then took it out to explode. After repeated several times, it was found that the hot melt adhesive was completely peeled off and the plug was easily removed. .