Monthly Archives: July 2013

What type of voltage and current do LED lights require to operate?

Conventional incandescent lamps are made to operate on standard AC power. Descrete LED chips themselves are designed to operate on DC current typically in the 350 mA range. As a result LED bulbs are designed with built in AC to DC converters that supply the correct current needed for the specific LED chips. LED lights may be used in place of traditional incandescent lamps without changing the fixture. Please note that most LED lights are not designed to be used with dimmers. Do not install an LED bulb into a dimmer controlled circuit with a properly designed LED lamp.  Flourescent Tube lamps operate with a specific ballast. To install a T8 LED tube replacement, the flourscent ballast fixture must be removed or bypassed to provide the standard direct connection of the 110 VAC power to the T8 LED tube.  One end of the tube receives the positive and one end receives the nuetral.

Why is LED lighting better for the human eye than fluorescent or incandescent lighting?

The human eye is constructed for viewing our world in the broad spectrum of natural sunlight. LED light transmits 90% of the sun’s spectrum, and is far closer to natural light than fluorescent, incandescent or induction lighting. LED light allows people to see the true color of objects and their surroundings, making it an ideal choice to display products in the best possible light – literally.

Can the LED T8 tube be used outdoor directly?

If T8 tube will need to install outdoor location where the tube will be sprayed by water or immersed in water shortly, there is waterproof tube with protection grade up to IP67 fit for these cases. The waterproof tube two end are protected by waterproof plastic nut and cap, wires out and can fixed by screws at two ends.

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What is compact fluorescent? What is the difference between compact fluorescent and LED lighting?

The compact fluorescent is basically the same as a fluorescent tube. It reaches its maximum brightness in 1-2 minutes after turning on. Fluorescent lamps and compact fluorescents are designed for persistent use. Too many switching on and off can cut down the already short lifespan of a few thousand hours. LED differs from compact fluorescents in two main areas: it uses about 50 % less energy and constant switching does not affect its lifespan.

What transformers are the most suitable for LED lights?

Electronic transformers do not work with LED lights. When replacing your transformer / power supply with a new one, we strongly recommend you purchasing a dedicatedLED power supply / transformer. The right kind of transformer is an investment to guarantee the maximum lifespan of the LED lights. This would need to be a constant voltage LED power supply / transformer.Unlike electronic transformers, commonly used for halogen lights these do not have minimum load requirements, but do have a maximum so make sure the sum of Wattage used by your LED lamps or lights is less than the maximum rating of the LED power supply / transformer. To maximize the efficiency and lifespan of your LED transformer keep the total power consumption close to 80%.
Please note: LED power supplies / transformers are design specifically for LED lights.

What’s the difference between Constant Voltage and Constant Current drivers?

With Constant Voltage the LED module only requires a fixed voltage, often 12VDC or 24VDC. The current is usually regulated by either resistors that have been wired in series with the LEDs or by an onboard built-in regulator driver that the LED module may have. This arrangement is often used in signage where it is not known prior to the installation how many LED loads there will be and in linear architectural designs where there are a number of LED modules connected together. Constant voltage loads may be added in parallel across the output of the driver until the maximum output current is reached.
With Constant Current the reverse is true, the current is fixed by the driver while the voltage will vary depending on the load. The more LEDs are attached, the higher the output voltage will be, up to a maximum set by the driver. This is usually used when the load/number of LED’s is known and you want optimal efficiency, as in a recessed downlight or track fixture.

How can reach that effect?

What I am looking for is a 2 LED kit, 1 red 1 white. That I can go from strobe to fixed white or fixed red. How can reach that effect?

We can use:

1x white LED light

1x red LED light

1x 24key IR RGB controller

 

The LED light, you can use 12V LED flexible strip in White and Red color, or other 12V LED lamp. There is a lot of the strip choices, in below link, we can find one suitable.

http://www.ledlightsworld.com/led-strips-flexible-led-strips-c-1_49.html

The 24key IR RGB controller is like below.

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Connection of the kit

Note: The RGB controller has 4channels, one for + poles; the other 3 are all – poles. You can use any two of the – poles. And the kit suggest here is 12VDC operating, it need c to run.

Now after you connect the LED and controller like this, then you can use the remote to reach the effect you want.

What is the difference between Watts, Amps and Volts?

We measure electricity by it by its effects on applications. An Amp (amphere), represents the amount of current in a circuit. Voltage, scientifically is the circuit’s “potential difference,” and this can be seen as the amount of “pressure” that drives electricity in circuits. Watts measure the use of electrical power, and 1 Watt is equal to 1 Volt, multiplied by 1 Amp. To understand this better let’s think if it like this… One commonly used analogy is that of the garden hose. The water pressure in the hose represents the voltage, and the amp value represents the volume of water flowing through the hose. The wattage, then, is the total amount of water that comes out of the hose, per unit of time.
So, using this analogy and think in terms of an electrical wire, it is simple to see how they relate. In an electrical circuit, the voltage may be 240v (as it is in most electrical outlets in the United Kindgom), and most appliances are set to run on this particular voltage, although each individual item will operate at different Amp levels, and therefore at a different Wattage.

What is the lumen of the led strip

Total leds multiply by lumen of each led, then to multiply by 0.8 which is the lighting effect for the milky white cover, and to multiply by 0.9 which is lighting effect for transparent cover. For example,T81.2 milky white cover,276pcs leds. Each leds is 6-7Lumen:276*6.5*0.8=1435.2.

 

Remarks: luminous flux=qty of leds*Luminous*transmittance. The qty of the led is consult, and the luminous is affected by drive current, CRI and color temperature. The small driver current,. The luminous is small. High CIR, then small luminous. The high color Temperature, then big luminous. Light transmittance is also changing. There are several kinds of material for the cover, like PC, PMMA, plastic, etc. The light transmittance of the plastic can reach to 97%,and the light transmittance for the PMMA can reach to 93%, the light transmittance for the PC can reach to 90%,which means the light transmittance through transparent or translucent body with its the percentage of the incident light flux. Milky white cover with lower light transmittance. That is to say light transmittance=the material of the light transmittance*(1-dimness).

I need RGB LED flexible strip in different model, what do you have?

The RGB flexible strip family

#1 5050, tri-chip LED flex strip

Available model:

SMD5050-150LED/5Meter

SMD5050-300LED/5Meter

SMD5050-600LED/5Meter

SONY DSC

5050-300N RGB

5050-600 RGB

 

#2 Side Emitting RGB LED flexible strip, the light is projecting from the side.

Side View RGB

 

#3 RGBW/RGBWW/RGBNW LED strips

4in1_RGBW_strip_difference 5050-150_rgbw.main

As the RGB color strip can mix to get high color temperature white color and not so pure, so a new RGB color changing strip with extra pure white color is available.

You can select to get RGB+WARM WHITE (3000K-3500K), RGB+Natural White (4000K-4500K) and RGB+Pure White (6000K-6500K)

 

LED Car Bulb with Dual color switchable

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Above is a 9LED LED G4 bulb with 6pcs Warm White and 3pcs Red LED. No need for big double bulb fixtures and 3-way switches. This is all accomplished using a digital latching technique within the bulb’s microprocessor electronics. The bulb senses each toggle of the switch and latches into the Warm White mode if the switch is toggled off-on within 3 seconds. To revert to Red mode is a simple off and back on with a 3 second delay.

It is your choice whether you want Red or Warm White, and the control is all done using your existing switches.

If you want other color mix, like, Blue/White, Red/White, this is also available.

There are dual color switchback LED car bulbs. The new switchback design makes it perfect for turn signal lights.

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Are E26 and E27 light bulb bases interchangeable?

Yes. The E26 is the standard 120 Volt American base. The E27 is the European variant and is rated at 220 Volts. E26 is 26 mm and the E27 is 27 mm diameter. However, an E26 bulb can fit in E27 base and an E27 bulb can fit in E26 base without problem. The sockets / bulbs are interchangeable except for the voltage rating. Therefore, LED E26 bulbs that are universal line-voltage can be used in both E26 and E27 sockets.

What color temperature is well suited for diamonds and jewelry in general?

The best color temperature that is well suited for diamonds would have to be in the range of 6000-6500K or Kelvin color temperature. 6000K is your neutral white daylight color, anything under will start to turn to the yellow category and anything above will turn to the blue category. A bluer cast over diamonds will sparkle them fantastically, but they would give a lot more of an unnatural tone to the jewelry. Therefore getting the best possible neutral daylight look will not only sparkle your jewelry but bring out the scintillation and clearly define the Cut, Clarity and Color of your diamonds as well as all your other jewelry whether it be fine jewelry, fashion jewelry or costume jewelry.

How does ambient temperature affect LED efficiency? What is junction temperature?

LED fixtures must be designed with junction temperature thermal management as a key component and use the correct LEDs. These products will then be robust enough to operate in most ambient temperature applications. Unlike fluorescent sources, cold temperatures do not impact the performance of LEDs.

Junction temperature is the temperature at the point where an individual diode connects to its base. Maintaining a low junction temperature increases output and slows LED lumen depreciation. Junction temperature is a key metric for evaluating an LED product’s quality and ability to deliver long life.
The three things affecting junction temperature are: drive current, thermal path, and ambient temperature. In general, the higher the drive current, the greater the heat generated at the die. Heat must be moved away from the die in order to maintain expected light output, life, and color. The amount of heat that can be removed depends upon the ambient temperature and the design of the thermal path from the die to the surroundings.

How to avoid voltage drop in a circuit?

Design the circuit with the shortest path possible between the electrical source and the end devices. The voltage drop in a circuit is increased as the length of the conductor is increased. Designing a circuit with the shortest possible cable run reduces voltage drop and saves significant investment required for conductor material.

Increase the conductor thickness, lower the gauge, to reduce resistance. Resistance is a naturally occurring process in conductor material. Resistance reduces voltage and converts the lost energy to heat. Increasing the thickness of the wire lowers resistance, and as a corollary, voltage drop,in a circuit.

Remove any unnecessary connectors between the electrical source and the end point of the conductor. For example, it is preferable to run one long length of conductor material as opposed to two smaller lengths that are spliced together. Connectors reduce voltage and provide points of weakness in the circuit.