Q:How are LED lamp quality is good or bad?

Drive power. A good driving power can guarantee a whole lamp life, theory of life LED lamp is 100 thousand hours, and the driving power of general life ranging from less than 50 thousand hours. So in order to ensure the whole lamp life, LED lamp manufacturers tell you that the driving power is very important, and it is also one of the most critical components. On the other hand LED downlight must be a constant current power supply, if using constant voltage power supply low cost will greatly shorten the service life of LED lamp. Then, how can we identify the constant current power supply? You can see several parameters, service life, light, light effect and warranty period. If the service life is longer, the quality of the power supply will be relatively better.

Q:There are no holes 7 cm, 9W led downlight

9W downlight generally open hole is 11 cm...Go and look for it on Taobao

Q:The office, sample room, corridor, the most commonly used several LED downlight which is several dimensions, what is power?

You should use big ones. My home is small, 5W's PL*D005

Q:LED ceiling lamp and LED downlight what is the difference

The ground is the vertical light lamp, ceiling lamp is light.

Q:LED is not only the benefits of downlight what harm?

And before the benefits of lighting equipment is quite obvious, if you really find faults if I feel bad replacement replacement, light bulb was down for a new can, to LED welding, when the current had a high fever bad replacement is more trouble, but because the LED lamp from the battery or the charging the battery power supply, basically there is no current unstable situation

Q:Excuse me, how to install the LED lamp?

According to the instruction, the hole is opened on the ceiling with an openerThree: after opening the hole, pull out the wire, then connect the drive and the lampPay attention to the positive and negative poles of the lamps and lanterns, the ground mark of the lamps and lanterns, and correctly install the ground wirePay attention to the distance between the fixtures and the wall or the wall so as to facilitate the heat dissipation of the lamp

Q:Turn off the lights after the bright LED lamp

Because the electrician is working on the power off switch, the power switch is a zero line, not a live wire. Electricians know that the power switch must be cut off by the line of fire, and no danger of electric shock is announced. If the power switch is on fire line, after the power is cut off, the FireWire will continue to supply power to the LED driver. Therefore, the LED lamp will have a faint light when the switch is turned off.

Q:LED downlight downlight and how to distinguish?

The lampshade can be made exactly the same. Distinguish between LED and ordinary lamp can see the inside of the light source, is a common lamp installation of energy-saving lamps. It is an LED light source lamp

Q:The general living room to Amdo large size of the lamp?

Look at the size of the living room ceiling. Class one is. 10 cm downlight

Q:Common questions about LED downlight spotlights

According to your lamp data should be 4W your dimming driver is 6--12, 12V4 is only 6W output power so only one use, otherwise affect dimming