How to handle led mounting hole?
Maybe you would ask that how to handle led mounting hole? when prepare mounting hole for your led project. because there are a vast array of led ,so for the led industry has no uniform standards for led mounting hole. we have but too many experiences to share.

The embedded led need a mounting hole when it is ready to install , and it is usually an circuit .the hole. mounting hole size is inner diameter , diameter value is external diameter.

The square led hole , it is usually refer to side length of mounting led.

Of course, there are also part of mounting holes is set according to the requirements of the customers.

led phosphor self-heating mechanism

Led phosphor work produces heat, and the led phosphor work is easier to heat than led p-n junction. reason is conversion efficiency of led phosphor do not meet these criteria 100%，As phosphor is sucked from the blue light change into the yellow light, part of light energy is converted into heat energy, led phosphor is mixed with silica gel,hermal conductivity of silica gel were very low. just only have 0.16 W/mK，in that case, the heat will be accumulated in a small area. and the heat could suddenly become much hotter. the greater is the led light density, the  led phosphor of heat release was increased.

Creates performance lowest led currently test standard

The Companies(www.ledlightmake.com) Act lays down a set of minimum currently requirements for test led.

1, Using seriously in accordance with earlier test standard: first we give 90% off our normal led operation currently, then a tester verifies that the led bright and color temperature match? whether it handicaps led in work?
2, According to instruction and operation manual of the engineering department to setting up lowest led test currently.

led leaked currently
This article paper how to use the linearity of index multimeter’s non-linear resistance grade. It states that you should analyze led ledaked currently when measuring semiconductor devices.
The next article also describes the led test of leaked currently. in a strict sense, if you are not professional, don’t try to do it on test led. must use the specialized equipment to test led. if you could not find a specialized equipment, try to use the multimeter.
we are getting multimeter (index multimeter) ready now., When a 10k register gear is change. connect led positive with black point first, then connect negative pole with red point,now the resister value is very small, That means led might be good. then ,we will go to test that led leaked currently. When measuring the led leaked currently, the red test pen should be connected to the positive electrode, and the black one to the negative electrode. again, it’s a small, that means that the leaked current is too large. and we are know that if the current is too large may has a bad effect on led security. so we need to check down the exact circumstances .

why the constant current power of led can’t allowed to no-load?
The constant current power to ensure the stable currently , no matter how load .the paper takes the ideal mode as an instant to realize the support the claim. for example we has a constant current power as 1 ampere and 1 Ohm load resistance. the output voltage is 1 voltage. the constant current power gets output resistance and output voltage is infinity when output is open-circuit. at this time the constant current power will produce of high voltage. likely corresponding to increases in the rate of damage.

_{The main constraint on development of LED switching power supply}

A kind of high frequency pulse electrical switching power supply for the led course for the future . working at the resolution limit of high frequency pulse electrical switching power supply, it will enable the ultimate in miniaturization and performance. Entering into the 21st century, the technology of LED switching power supply has obtained the unprecedented widespread application in various fields. in addition the research of LED switching power supply has great significance to saving energy, saving resources and protecting the environment