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Bathroom ceiling light LED retrofit

Yes - I would try the LED Flood light first which generate less heat than incandescent. This is less work than trying to convert the current can mounts to 4" round to mount the flat panels that are mounted by a crossbar in the outlet box. Flat panels do not need a can, but still needs feed outlet, either for power and some for the mounting point. Below is link to one brand/source that you can select the color temp, etc.Sample of Selection of color temp - LED Flood

Can I connect my Samsung 32J4033 LED TV with my Android mobile phone by Wi-Fi or by Bluetooth?

Yes you can, only if it is a smart TV.If its just a normal LED TV, then you cannot.You can make it smart though, by using either Google's Chromecast or Amazon's Fire TV stick and stream content on your TV, if that's what you want to do by connecting your android phone to the TV.Hope this answers it.Can I connect my Samsung 32J4033 LED TV with my Android mobile phone by Wi-Fi or by Bluetooth?.

Adjusting LED currents same level for different voltage levels

The smaller voltages would make it more difficult to light an LED with the same intensity using the method you talked about. I would probably use the different output voltages turn on N CH MOSFETS with very low Threshold voltages. Vdd should be 12 volts. Adjust your resistor values between the Cathode of LED and the Drain of MOSFET.

LED light DROID 4

You can use Light Flow to customize LED notifications; it also has a lite version.Light Flow allows you to take control of your notification LED colors and makes them successively flash one color after another.It also allows you to set repeating sounds on vibration patterns for you notifications. You can also set a "sleep" mode or "on charge" where the lights and/or sounds and vibrations will not be heard or seen.

what kind of scientists study/create LED / OLED displays?

Surely Electrical Engineers do this. But there are two types of Electrical Engineers. One who deal with power and the others who play with circuit design. Precisely , Circuit design professionals work with LES's or OLED's.

Constant Current Square Wave through LED

Why not use 1 side of an SN754410 Quad Half H-Bridge and ToneAC on the Arduino to drive the LED ?I am using this to drive 4 LED units, each 4.5V 54mA from my Arduino. My main power supply feeds a 7805 voltage regulator, and this supplies the Bridge. A diode on the output side drops the voltage to around 4.7V, and total current = 54 x 4 = 216mA.

Do you think that the energy saved by using LED outweights the risk of lead?

You will probably be delighted to hear that it is no longer much of an issue, as Lead (Pb) free LEDs are already in the marketplace (first link provided below), and several countries have already taken the lead in setting standards to eliminate LEDs containing lead already (second link). Arrangements should be made for the safe disposal of those which are in circulation, however they not that dangerous individually as they contain only very tiny amounts of lead usually in a sealed unit.

Do LED lights get gradually dimmer as they age or just suddenly fail?

Both failure modes occur. Generally more outright failures occur, due to cheaply designed power supplies that fail. But LEDs with simple power supplies just get dimmer with age. Sometimes power supply over voltages cause a premature failure of the LEDs, or heat build up will.

Pi 3 not turning on red LED only lights up and the green LED lights up for 2 seconds before turning off

The number of times the green LED flashes indicates what the problem is:For Pi's running firmware before 20th October 2012:For newer firmware versions, so this will apply:I think the quickest fix is to backup anything important on the SD card. And try installing Raspbian again but on a different SD card

What happen if i connect the capacitors with few LED Strip in parallel?

Yes, because they are in parallel. Which means that if the LED strips are different lengths, the voltage drop through each LED wo not be the same.No, the current through the capacitor will be higher so it will discharge faster. You could use a higher-value capacitor to compensate for this.

Resistor calulation for two LED

I use two similar IR LEDs to send short RC code bursts without resistor without problems. If that#s your application then you should be fine. You may run into burned out LEDs, though, if the pin stays high for too long due to some issue.

Do you absolutely need an LED or UV light for gelish/shellac nail polish?

You would better use an LED or UV light for nail polish and the UV light will make your hands become black after you use for a long time and it will take more time if you use UV light ,so I suggest you use LED light. You can search led lights special for nail polish on website there will ba many kinds and you can choose one

How do you like the Lg LED HX301G LG projector?

First of all I have to say that I do not own one of these but I took a look at low budget LED before getting a standard lamp sourced projector. From what I understand, the HX301 can suit your needs but it has some serious drawbacks. It has quite a low resolution because a higher resolution LCD would block out too much light for the LED source to be useful. this means that image quality suffers because of both the low resolution and the low light output. None the less, if you can find a space that's dark enough, get a decent screen for it and do not care that much for high resolution movies people have achieved some very decent results. With the added benefit of functionally never needing to change any lamps. Check out some youtube videos for examples.

Will LED lights ever be practical for home lighting?

The guy who said they are a fire hazard was either a liar or an idiot. I have a mag flashlight with an LED. It is super bright. It's a blue shade of white though. Just like incandescent lights and fluorescent lights are a different shade of white, LEDs are yet another shade of white. It would be nice if the color could be changed, but even the way they are would be good for hallway lights and bathroom lights.

Is it possible to increase CRI of LED lights/strips by using different ones together?

OSRAM published an exhaustive document explaining the limitations of CRI and the case with deep red. It also describes the mixing of white LEDs with amber LEDs to obtain a high-CRI (including R9) light with high emission efficiency.http:/ledlight.osram-os.com/wp-content/uploads/2012/02/OSRAM-OS_WEBINAR_HighCRI_06-26-12. pdf.

Ohms law and LED driver efficiency? How can this possible be true?

He's trying to sell you something that consumes > 30 W as a "30 W driver", whereas it actually can only supply less than 30 W. The ratio between power that goes in and goes out is called the efficiency. The difference in power in and out is simply converted to heat. You can upgrade your LED driver to a 2500W LED driver simply by putting it in parallel with a water heater of roughly 2470W, or any other resistor, for that matter. You can simply waste more energy.So, that's what we call a scam and that's why we only buy from reputable sources in jurisdictions where one can ultimately sue someone.As a personal note: Do not argue with someone who will be getting your money. Simply make "fulfill this or do not get the deal" statements. Make the requirements verifiable, as in "The driver has to deliver /$x/$ A at /$y/$ V with a ripple of less than /$/delta/$ V and without getting hotter than /$T/$ °C in continuous operation. These are my requirements, and I can only pay for equipment that fulfills these. ".

Broken LED's on PS3 controller?

As far as I remember, the LED unit is one piece, but you wo not really know what is broken unless you open your controller and look in there. You may be able to salvage the remaining LED's but I am not sure. Opening it and taking a look will be your best bet. If they are soldered to the board then, no; unless you can solder it yourself and do it that way. If it's a plug or wire or something like that, it should be simple. If it comes off, it should be able to go back on.

Which tv is better for movie viewing experince LED OR PLASMA?

LED is better by a long shot, here's why: - Superior picture quality, with a seamless refresh rate. - Cost Effective - Viewing 3D movies with an LED is so better - And of course, if your a gamer, you can enjoy that amazing virtual graphics that the PS4 is capable of creating.

how much to fix an LED tv with a cracked screen?

Just too bad . to replace the “ LED display display panel “ total cost is about 85 % of same screen size new LED TV. cracked screen = DISPLAY PANEL. cannot be repair-change parts . need to replace !! display panel sold as spare parts with out warranty. you take own risk after replace . get an new TV consider is much cheapest.

Can an RGB LED reproduce the colours as we see on a PC monitor? [closed]

Sounds like it -might- be working the way you need it to. What you are missing is a diffuser/combiner for the light coming from the LED. When you look directly at an RGB source that's not diffused you will see the individual colors. As for dark grey vs white, that's a matter of relative intensity (assuming everything's balanced).I've used ping-pong balls for diffusion- I am sure there are better solutions but that's what I had at the time. You could also try sanding the LED lens so it acts as a diffuser. If you let us know what you are trying to accomplish we might be able to come up with a more 'targeted' solution/suggestion for you

Is LED lights really that wonderful?

LED lighting uses approximately 10% of electricity than that of a standard light bulb. Energy efficient LED lighting creates less carbon emissions, which helps our environment as well as saving you money. :)

Can I replace a Maximum Bulb Wattage (Watts) 25 halogen light bulb with 5w LED light bulb? Is it safe?

When choosing lamps, as long as the actual wattage is below the rating of the fixture, you are safe. It does not matter that the fixture generates a lot of light with the watts it consumes. The equivalent wattage they talk about, like where they say this 3W LED has light output equivalent to a 15W halogen, does not matter when selecting lamps for a fixture. The 3W actual wattage determines how much heat it may generate, not the 15W equivalent light output. In fact it's likely that the LED is more efficient, with less of the electricity consumed turning into heat and more into light, but you can not count on that. Just go by the actual wattage

Why did my 9V battery die when hooked up to a simple LED light?

Very undesirable theory or layout to skill unmarried LED with 9v cellular, 70% of cellular capacity develop into wasted into ineffective warmth. replace it with 2 AAA cells to make a 3v battery %.. placed one 30 ohm 1/2 watt resistor in sequence with LED shall gentle it up and extremely last 10 circumstances longer than 9V cellular.