LED Technical

Q1.What’s LED?
LED is short form of ” Light emiting diode”, is a semiconductor device that emits
visible light when electrical current passes through it, it is a special kind of diode.

Q2. How LED innovate ?
In 1955, Mr Rubin Braunstein from Radio Corporation of America invent GaAs
and other semiconductor infrared ray.
In 1962, Mr Nick Holonyak Jr from General Electric Company of America invent
visable LED.
In1994-1995, Mr Shuji Nakamura from Nichia Chemical Industries Ltd has
made breakthroughs in GaN research, and invent Blue LED, after that, white LED
and other color of LED has been invented.

Q3.Why choose LED decorative lighting and daily lighting? What’s the advantage of using LED products?
*Bright, soft light and safe
The LED can emiting very soft but also bright light which will not be glare and hot, using led
will be very confortable for your eyes. LED is Cold lighting , so it is more safe.
*Low power consumption-Energy saving
LED LIGHTING, 1000 h only consume 1 kWh current,Compare to incandescent lamp or halogen lamp,LED can saving almost 80% current.
*High reliability and Long lasting
Usually LED life will be 20,000-30,000 hrs depend on different models, this means led can be
lasting use about 16 years( if daily use 5 hours average), which incandescent lamp or halogen lamp only can use about 8 months.
*Fast switch times and environmentally friendly
LED don’t include lead and mercury, it is environmentally friendly.
*Easy to fix and simple for transportation
LED is light weight, simple to use and transport, people without technical also can fix it
according to products instruction.

Q4.What color of light LED can emit?
Most LEDs Light color is associated with the light wavelength. LEDs made with different
semiconductor materials emit lights in different wavelengths. LED light wavelengths range
from 400 nanometers (blue) to 800 nanometers (red). The popularly LED colors available
in the market are blue, red, orange, yellow, green, and white, warm white, purple.

Q5.LED color chart

Q6.What’s LED drivers?
An LED driver is a self-contained power supply that has outputs matched to the
electrical characteristics of your LED.

Q7. What’s LED rope light?
An LED rope light is a type of decorative lighting fixture. It typically uses small light
emitting diode, or LED, bulbs linked together inside a plastic tube to create a string of lights that can be used in many applications both indoors and outdoors. Compared to traditional rope lighting, LED roping often has several advantages, including using less energy, appearing colorless when not in use and lasting longer.In general, an LED rope light is created by stringing LED bulbs together on a wire, then threading the wire through a clear plastic tube. The number of wires used to string the bulbs together is typically dictated by the functions the end product is supposed to have. For example, a basic rope will generally have just two wires, which usually allows the consumer to make the bulbs flash or dim. A rope with three wires allows for greater functionality such as flashing, dimming and chasing. End use is also affected by the width of the outer plastic tubing of the LED rope light, as the wider the tube, typically the less flexible it is. Our led rope light using 5mm diameter straw hat shape leds.

Q8. What’s LED strip light?
An LED strip light a type of Light Emitting Diode (LED) fixture. The light strips are typically flexible,
making them easy to use for a variety of lighting needs. The LED light sources burn very cool
to the touch and can save on energy costs compared to their incandescent counterparts,
not to mention they can last for years. They also emit a light that is very pure and white,
closer to natural sunlight than any other manufactured light source. LED strips are
commonly available in a range of festive colors, including red, blue, green and orange.
Our LED strip light use SMD3528 and SMD5050 LEDS, the LED strip are less weight than LED rope light and have more brightness than LED rope light.

Q9.LED tubes, bulbs and down light
They are be used to replace incandescent and florescent light bulbs, halogen lamp bcz of no stroboscopic, much more longer life, much less current consume. LED lights are more rugged, and safer in terms of danger of fire and electric shock.

Q10.There are so many advantage of LED lighting, is there any disadvantage?
Even there are so many advantage of LED lighting compare any other lighting, but there are also some disadvantage of LED lighting such as output limitation, small angle range, while incandescent and florescent light bulbs illuminate in all directions, but all these disadvantage will be solved by technical development.

Q11.Why LED cost is higher than traditional lighting?
The main cost of LED is chips, chips are costly but the cost is being reducing unceasing, and now many LED lighting are acceptable for general customers, even we have to pay little higher for different type of LED lighting compare to traditional lights, but finally, when we using LED lighting, we can save much more current fee, so the over paid cost for buying LED lighting we will get back from current fee within 6 months or more. On a long view, by using LED lighting can save much more.

Q12. What’s Lumens of LED
To know how bright something is, we have two things to consider.
a. How Bright is that light?
b. How much light is falling on something a certain distance away?
Lumen is a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions

Q13.What’s LED Lux?
The lux (symbol: lx) is the SI derived unit of illuminance or illumination. It is equal to one lumen per square metre.

Q14. What’s SMD LED?
SMD is surface mounted devices, it is one type of SMT(surface mount technology), SMD LED is one type of LED.

Q15. How to calculate between Amp, current and Wattage?
Wattage=Amp x Voltage

Q16. What’s LED Amplifier
LED power amplifier is specially designed for single color and RGB controllers to amplify power output, it accepts PWM signal, double or three times more power can be reached by every one more power repeater, and in theory power repeater can be added unlimitedly.

Q17. What’s LED RGB controller?
It is controller of LED lighting, that can control the color changing of RGB LED lighting.

Q18. What’s Bridge rectifier?
A bridge rectifier makes use of four diodes in a bridge arrangement to achieve full-wave rectification. This is a widely used configuration, both with individual diodes wired as shown and with single component bridges where the diode bridge is wired internally.

Q19.Why LED products are expensive and price is higher than incandecy bulb?
Yes, it is true that LED products are a little more costly than incandecy bulb, energy saving lamp or fluorescent tube. But in the long run, LED products are much more energy saving than any other lights. We have to pay little more to purchase an LED product, but within 6 months or more, we will get back the cost by saving current. The over paid cost for purchase an LED product, you will get back within 6 months or more. The most important thing is, you will continuesly saving more current, and the life of LED products is much more longer than any type of other lights, you no need to change your lights yearly.

Q20. How to calculate illuminance of lights? How to calculate the quantity of LED lights for an area?
E (average illuminance) = (luminous)×(CU)×(MF)÷ illuminate area
CU: indoor= 0.4 ; sports =0.3 MF:0.7 to 0.8.
lights qty =(E× area S)/(single light luminous flux Φ × CU × MF/K )