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â¢ RELATED QUESTION
bright LED on IO-Pin without additional transistor (PIC 12F)
The issue with using a microcontroller's GPIO pin directly, to operate an LED brightly, is that the current that passes through the LED to light it up, also has to pass through the GPIO pin and out through the microcontroller's ground pin, for the circuit to be completed. This is called sinking of current. While many microcontrollers are rated for sinking 20 mA or more through an individual GPIO pin, some are not. More of concern, when one has multiple such current sinking connections, these currents add up at the MCU's ground pin - which itself has a limit, differs from MCU to MCU. Solution: Drive your LED with very low current if you absolutely must save on the transistor. A typical indicator LED will light up pretty brightly even with 3 or 5 mA of current - try it for yourself
How LED bulbs work on 220 volt AC?
The LED (Light Emitting Diode) is a diode, which emits the light when the current passes through it.The LED works on the DC source (a constant current with sufficient forward voltage).Basically the LED transforms the electrical energy into light(around 30%) heat(around 70%). The life of the LED can be stated as 30% loss of luminous intensity from its initial light output. Heat is the biggest enemy to LED.In general, an LED Bulb is designed to operate on 100-270VAC by using an AC-DC driver. The AC-DC driver provides certain DC power(Certain Voltage & Currents) to operate the LEDs. The LEDs will be mounted on a PCB (heat sinking material like Aluminum) to dissipate the heat generated during the operation. This makes the LED life to grow. The more heat you observed means the life of the is less.If you still have Queries, feel free to ask.
LCD 1080p vs LED 720p?
With a 32â HDTV there is no point in 1080p unless you plan to closer than 6' (1st Link). Do not waste money on 1080p. LED uses less power than LCD, true, but budget LED TVs tend to be plagued with edge lighting effects (a bark image shows the LED edge lighting around the image) ... which is bothersome. When done right local dimming using LED lighting is a beneficial over LCD fluorescent lit models (See 3rd link) but budget TVs often do not provide this feature. Emerson and Sceptre are budget brands not known for quality or longevity. I recognize that you have budget issues, but it is almost always better to buy a quality product rather than a budget model. The 2nd link lists the âbestâ 32â and less HDTVs. I strongly suggest considering looking for one of these (or, similar models) on Black Friday sale .... or consider looking for a used TV (there are often bargains on smaller TVs as people trade up). While you wo not get a warranty or the latest features, flat panel HDTVs that work for the first few months (when most faults show up) are pretty good bets to work perfectly for years after that. And you can save lot's of money. I just saw a 32â Sharp Aquos HDTV for $200 on Kijiji. Good luck
differences between LCD and LED tv?
both are LCD displays. LCD is passive, it does not emit light, it controls llight. in the normal LCD display the light is generated by a broad spectrum bulb or tube in the back of the set. in the LED display the light for the LCD is generated by LEDs. The advantage of LED light source is they have excellent purity of color, very precise red, green and blue spectrum
Why does an 800 lumen LED bulb seem so much brighter than an 800 lumen fluorescent bulb (both are standard-Edison based)?
It has to do with the wave length of the LED light bulb vs the wave length of regular incandesents. Since LED waves are tighter they generally project farther.Another factor contributing to the LED lamp seeming brighter is that incandesent lights emit light out from the center and LED lights project out in a single direction from the source. This generally allows for more of the light to be focused where it is needed and not lost lighting things like ceilings that donu2019t require much light.Why does an 800 lumen LED bulb seem so much brighter than an 800 lumen fluorescent bulb (both are standard-Edison based)?
LED capable of either IR or visible light (not at the same time) [closed]
Emitters with both infrared and visible light can be found by searching for "infrared dual emitter" or "infrared dual LED". For instance, one such part available in my geography is the Osi Opto DLED-660/940-CSL-3, a side-emitting LED with 660 nm red and 940 nm IR, independently controllable (common anode).The bidirectional (CSL-2) type might be preferable for simplistic applications such as mentioned by OP, where inverting the voltage would switch between IR and visible emission, without both being needed simultaneously.
What are the main uses of LED canopy lights?
Outdoor spaces like gas-stations, open-air dining areas, etc. need lights that provide better lumen output. Our collection of Outdoor LED Canopy Lights is the right choice when looking for lighting options for outdoor spaces. These lights come with premium-quality surface-mounted(SMD) LED chips that make them robust and reliable. A high lumen output will ensure that the outdoor areas will flush with adequate amounts of light. These Outdoor LED Canopy Lights offer a high color rendering index (CRI) that will let you see every object in its true color. Also, these lights come with an easy set of instructions that makes the installation process easy and fast. These lights are perfect to use at places that need many lighting fixtures. So, if you wish to save money on the utility bills, go for LED canopy lights!What are the main uses of LED canopy lights?.
What material provides the best cooling for LED lighting?
The cost of producing LEDs is anticipated to reduce significantly by 2015. The US Division of Power projections that the production expense of an LED luminaire or component will drop by about 40 to 45 percent over the next 5 years. These cost savings will certainly be even more improved by government subsidies and also discounts. Lumen result is an additional crucial consider the adoption of LED lighting. Although LED innovation continues to breakthrough, high-lumen-output LED applications can not be achieved with passive air conditioning alone. LED lights cooled down by an easy warm sink, rather than with an energetic air conditioning solution like a synthetic jet, are inherently bigger, makings retrofitting tough. A smaller heat sink may result in a light or luminaire that is less reliable because of warmth damage to the LEDs, or a source that produces insufficient light for market success.In order to reach the preferred lumen values in a fixed kind variable, energetic cooling could be required to dissipate the heat generated by the LED components. Some energetic air conditioning options, such as followers, do not have the very same life span as the LED itself. In order to create a viable active air conditioning solution for high-brightness LEDs, the method of thermal management must be naturally reduced in power usage, flexible enough to suit a little form variable as well as have actually an anticipated life equal to or above that of the light sources.Synthetic jet coolingSynthetic-jet innovation offers an active air conditioning solution for LED illumination, and has actually been adopted by many major worldwide lights firms. The portable air conditioning components resolve all the restrictions presently hindering the advancement of LED lighting: efficient warmth dissipation, small kind aspect and also dependability. Marine LightingWhat material provides the best cooling for LED lighting?
Is there such a thing as a LED that can change colors based on user input?
yes and no. LED's alone are single color. You can purchase an LED that has 2 color are 3 colors. What is possible is color mixing. You can get one LED that has red, green blue (RGB) or just use 3 individual Red, green blue LED's, place them next to each other. If all of them are full bright, then you will get white (depending on how far your looking at the LED or if you have a diffuser on top of them. if you just have RED and BLUE on full bright then you will get purple. anyway, just get a microcontroller and have pulse width modulation to control the current going into the LED via a transistor. You should be able to get 255 colors (8 bits)
LED's brightness difference in these 2 circuits
Assuming the NOT gate will change 5V to 0V and 0V to 5V, the following happens:Circuit A: 5V -> resistor -> LED -> 0V resistor -> LED -> 0V, which is a normal circuit and some current will flow (depending on the forward voltage of led D1).Circuit B: 5V -> Not -> 0V -> Resistor -> LED -> 0V, which in principle means no current is flowing at all.Maybe the NOT component works a bit differently (maybe it changes 5V to 2V, or 0V to 3V or whatever. But anyway, in circuit A you probably have more voltage difference than in circuit B, and taking the forward voltage in account, I would expect circuit A to act with a normal current flow, and circuit B not at all
Can you purchase LED's for a Luxeed U5 LED keyboard?
Green LEDs seem to die. It will be hard for you to replace the LEDs. You would better ask the seller to replace the keyboard. Thanks
Micro-sized powered LED [closed]
How can i design a led panels of around 100 LEDS on a Vero Board with voltages of 5V and 10V ?
more slack: you only get constant current if you put them all in series. using a constant current source to drive 10 parallel strings will result in the same problems you get when you drive LEDs with a fixed voltage. Anee: Which is it? 5 volts or 10 volts? And what is the typical and max VF for the LEDs, that number is critical. If supply voltage is Vs and Vf is typical Vf of LED, then for 10 ma, you want resistors to be: R = (Vs - Vf) / 0.01 ohms. note that Vs should be at least 2 volts higher than Vf. Power dissipation is (Vs - Vf)*0.01 in watts, and you should get resistors rated at twice that number. .
How are LED light bulbs made?
Firstly, you get a lot of money, thenSecondly, in a clean room (Fab) you will build at great expense, you make some silicon wafers, the bigger the better, then plate/etch the wafers with LED chip images on a hot gas diffusion line and dice them into a potful of nice cute little LED chips; all after buying a bunch of chip fab machines from Applied Materials or similar which will chew up all your cash.Thirdly, you raise a bunch of millions more.Fourthly, you design and manufacture the circuitry to convert 120/240 VAC into somewhere between 4. 5 and 12 VDC depending on how you designed the chip sets and variable voltage/current management if you want them dimmable.Fifthly, (But you will repeat this step quite a few times), build a A18/20 and BR series bulb making plant with a final product assembly wing to build out complete LED bulbs.Repeat the step above to make additional types and shapes of bulbs and repeat step 4 to deliver advanced functions like color changing, dimming with color temperature change, and possibly WI-FI control. Oh, and write the app for iPhone and Android devices.Lastly, kick yourself for going hundreds or millions into debt and pledging your soul to various VC's, and declare Chapter 7 bankruptcy