2 Q: How can I place an order?
A: You can send us your requested items by email: signage@plhk.com, our customer service center csm@plhk.com we will reply you as soon as possible.

3 Q: Do you offer full export service?
A: Yes, we do. We are the professional signage exporter in China.

4 Q:Do you offer a warranty?
A: Yes we do. All products sold on this site come with a 12 month standard warranty on faulty goods. Extended warranty may also be offered for individual markets.

5 Q: What is an LED?
A: light emitting diode (LED) is a semiconductor device that emits visible light when electrical current passes through it, it is a special kind of diode.

6 Q: What color of light can LED emit?
A: most LEDs are monochromatic. 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 colors of popularly available LEDs in the market are red, orange, amber, yellow, green, blue and white.

7 Q: Can LEDs be used to replace conventional incandescent and florescent light bulbs?
A: yes and no. LEDs have increasingly been used in many different applications to replace old incandescent light bulbs. Examples include LED indicator lights for all kinds of electronic devices such as cell phone, calculators, automotive dash panel, LCD back-lighting, etc., LED seasonal decoration lights for Christmas and holidays, LED traffic signs and other LED direction signs, LED flashing lights, and so on. As currently available LEDs have limited brightness, in most cases, they can not be used to replace incandescent or florescent light bulbs for general lighting purposes.

8 Q: We have seen so many advantages LEDs have over incandescent light and florescent bulbs, are there any disadvantages LEDs exhibit compared with incandescent or florescent bulbs?
A: Yes, the most significant disadvantage is the light output limitation of LED. Most currently available LEDs emit limited amount of lights at a relatively small angle range, while incandescent and florescent light bulbs illuminate in all directions and give out much more brightness of light. And this is the reason why LEDs currently are not used for general lighting applications.
The second significant disadvantage is the high prices of LEDs. The currently available LEDs in the market are 2-8 times more expensive than equivalent incandescent light bulbs. This is why some customers still hesitate to buy LED products even though LEDs have so many obvious advantages over incandescent bulbs and people actually can save money by using LED products in the long run.

9 Q: Why are LEDs of some colors are more expensive than LEDs of other colors?
A: the reason is that different semiconductor materials are used for different color LEDs, and some semiconductor materials are more expensive than others; another reason is that manufacturing costs are different. White LEDs are the most expensive because red, green and blue LEDs are combined together to make a white LED.

10 Q: Why is the lifespan of an LED measured as lumen depreciation?
A: The lifespan of an LED is vastly longer than that of incandescent, fluorescent or HID lamp sources, generally can reach 50,000 hours or longer. Although the LED never really burns out, product lifespan is measured by lumen depreciation.
The Illuminating Engineering Society's (IES) current standard for calculating the life of an LED as the point at which the LED reaches 30 percent lumen depreciation.
Remember, a 50,000-hour rating is not equivalent to lamp life rating. LED life is rated where it has reached 30 percent lumen depreciation. At 50,000 hours an LED would still be operating, but at a decreased lumen output.
Based on how long a fixture is illuminated per day, here's what 50,000 works out to:
Hours of Operation: 50,000 hours is:
24 hours a day 5.7 years
18 hours per day 7.4 years
12 hours per day 11.4 years
8 hours per day 17.1 years

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