Frequently Asked Questions (FAQ) for Led Light Book
1. What is causing a white scale buildup at copper pin connection on LED light sticks and how can they be cleaned?Copper is a material that corrodes, just like any other. When copper corrodes, it will turn into copper carbonate (Cu2CO3(OH)2), but near the sea it might become copper chloride (Cu2(OH)3Cl) as well. When water is involved, like in your case, there may be an effect called efflorescence. Efflorescence "is the migration of a salt to the surface of a porous material, where it forms a coating". This usually forms in a crystal form, since it's formed of salt. This is what creates the white buildup sometimes found on water pipes for example: your case it's the same:So basically, you're getting water infiltration. The easiest solution to solve this is using dielectric grease. Or get a better seal for your electronics.------2. where to buy best and cheapest LED panels lighting?LED panel light uses high brightness LED as light source, which is suitable for hotel, bar,western restaurant, coffee shop, home interior decoration, interior lighting, and can directly replace the original ordinary fluorescent lamps, and its brightness is higher. Main performance and features of the LED instrument panel lights are as follows: LED panel lights are designed to be flexible LED is a point like luminous body, the designers design a variety of different shapes,different particles of the light source according to customer requirements by the flexible combination of point, line and surface, the design is very flexible. LED panel lighting illumination is high LED panel lights use uniform light-emitting reflective panel and sealed design, coupled with efficient light guide plate, and aluminum alloy material. Glow is even and illumination ishigher.------3. led lights for aquarium?Maybe you can search in the Internet,the network to find suppliers is a tide, can easily find it. But you should pay attention to some skills. LED light aquarium can be installed inside aquariums to supply lighting effects to the fish as well as plants. Theyre usually designed such as a long, slim stick, that might be positioned over head or even in back of the fish tank. Additionally, electronic shops offer LED spotlights which have been designed like a shower-head. These are also available in more compact, node-like lamps which have been divided through various shades of diodes. Give some details about the led lights for aquarium. There is also a website which is specialized in the led lights for aquarium.Hopping the websites can give a little help for you.------4. Should the use of LED light bulbs be banned in automobile headlights?If by "LED bulbs" you mean aftermarket replacement parts for halogen headlights, those are already technically violating the law because using those bulbs, which have a different shape for the light emitting surfaces compared to the factory lamp change the angular distribution of the headlight in a way that causes the headlight pattern to no longer comply with DOT rules (headlight intensity becomes to high and too much light is thrown above horizontal). Is a similar problem as illegal HID conversion kits that were popular 10 years ago.I'd like to see more enforcement of current rules against the use of dazzling lights. But I wouldn't ban an entire technology (LEDs) when said technology *can* be designed in a way that doesn't have those problems.Should the use of LED light bulbs be banned in automobile headlights?------5. Is using a (non-touch-screen) Kindle on Shabbat permitted?Aside from the electricity needed to change pages, I think the melacha that e-ink runs into is Tzovei'a (dyeing). You are not allowed to paint things, and color things, and dye things on Shabbat.The Kindle uses an Electrophoretic display, where basically, reflective titanium particles are suspended in a dark fluid. They are electrically charged to move to the from the front sheet of the display where they would appear white, to the back of sheet of the display, letting us see the dark ink. Pressing a button sends an electric signal to change their charges.That being said, there is a possibility that it is not dyeing.On transition eye-glass lenses, Chacham Ovadia said that they are permissible since it is not a normal way to dye.------6. Which LED light manufacturer do you think is the most trusted among other manufacturer?LEDs emit easy in a particular direction, lowering the will for reflectors and diffusers which could seize easy. this selection makes LEDs greater effective for many makes use of including recessed downlights and activity lighting fixtures. With different varieties of lighting fixtures, the sunshine would desire to be contemplated to the needed direction and greater desirable than a million/2 of the sunshine would in no way leave the fixture. the sunshine would desire to be of extraordinary coloration, with a brightness a minimum of as super as customary easy supplies and performance a minimum of as super as fluorescent lighting fixtures. The LEDs would desire to additionally eliminate darkness from promptly whilst grew to become on, shouldn't flicker whilst dimmed and should no longer consume any means whilst grew to become off------7. Can I connect an LED light fixture to a 240 volt oulet?Below is based on US 120V/240V system:An ordinary device (not talking about a tester that has access to hot/neutral/ground) can't actually tell the difference between hot/hot vs. hot/neutral. There is no polarity in AC as there is in DC. From a practical standpoint, it comes down to voltage requirements:So for a device that can use the entire range 120V to 240V (e.g., 100V - 277V), either one will work just fine. The exceptions come in three flavors:Bottom line: If the device (light fixture but sometimes other things such as computer power supplies) only uses two wires (plus ground, of course) and has flexible voltage (from 240V) then you can connect it to two hots instead of hot neutral------8. Low cost reptile lighting/LED lighting?First, you need to understand why you need the lighting in the first place. Does the reptile need full spectrum lighting for health, such as the absorption of calcium? Or does it just need light for day and night length cycles? It is easy enough to assemble an LED lighting system if you buy the pieces individually off electronic suppliers on the internet. You can buy the individual bulbs and electronic boards to arrange them in. Solder them together in a linear or pairwise fashion, depending on how efficient you want to current to be and how much soldering you want to do, then supply electricity. Price-wise though, this can still be a little much. Almost all LED systems have to be assembled by hand, which accounts for most of the cost.------9. Fog Light LED doesnt fit within housing?basically on the returned the place they do some thing clever. I even have had automobiles with fog lights furniture on the front as many times happening equipment yet under no circumstances observed any benefit over using the dipped head lamps. i think they might help oncoming motorists to be certain you in dense fog yet, if the fog is thick sufficient for that to count, all human beings must be going very slowly besides so as that they are going to see you in rather some time. in the united kingdom it rather is unlawful to apply fog lights furniture different than in fog. some human beings nonetheless do it it relatively is stressful yet has the earnings of offering a warning different highway shoppers that the offending automobile is being pushed via a tosser------10. HDD Blinking LED light?Typically the electronics of the device may be corrupt or it may even be a hardware problem and something has come loose. To fix this problem send the device in to have it checked if its still under warranty. Or for a do-it-yourself solution, you can replace the external case of the portable hard drive with something sturdier or more reliable. The first thing that usually, "goes", in portable drives is the interface connector between the cable and the drive. The flashing lights usually indicate power, and hard drive operation. In your scenario it seems to be indicating a code of a sort and it may be an indication of a hardware malfunction. Read the suggestion or fix indicate on their website regarding the flashing code this indicator may be indicating.------11. What gauge wire for long run from power supply to LED light strip?Is 5050 the model number or the quantity of leds?The cable you linked to looks very lightweight - you don't need a lot of copper to run leds directly off of low voltage DC but you do need to handle it a lot during installation.I would get something heavier, just for the mechanical advantage. 16AWG stranded 300 volt should do nicely, the voltage rating is to get thicker insulation. You can get spools of it in many colours from any electronics supplier (not electrical, "electronics") in the local phone book. Also pick up an automatic wire stripper and a decent crimping tool while you are there - the common stamped-steel crimpers do NOT do a good job, and you don't want to have to get in behind the walls twice------12. My HP Pavillion a1140n will not power up. The led light does not come on, but the disk drive lights up.?in basic terms unlawful to rigidity with highbeams in the direction of oncoming site visitors. It creates a protection probability - by potential of blinding oncoming drivers. Flashing your lighting fixtures furnishings, no remember if intense beams or perhaps in simple terms turning your lighting fixtures furnishings on and rancid is likewise unlawful. lower back, it ought to create a protection probability by potential of blinding or perhaps complicated different drivers. additionally, flashing lighting fixtures furnishings are reserved for emergency automobiles in basic terms. it extremely is the regulation, even nonetheless i do no longer think of a cop grant you with a cost tag for flashing your lighting fixtures furnishings. yet, you will get a cost tag for driving mutually with your intense beams on, in case you get caught------13. How do I wire LED light based zone for DALI dimming? closedNearly all drivers on the market will only occupy one "short address" even if they can drive multiple LEDs, lamps or tubes, so they will drive them to the same level. Any driver which is different, occupying multiple "short addresses" would probably make that clear in their information since it is unusual although valid.How you split up your downlights over different drivers depends on what level of control you want. If you will never need to control the downlights independently, then you can wire them all to the biggest driver you can find, or in groups limited by the driver capability but either way, in broadcast mode, all together. If you want individual downlight control, you need an address per downlight, which means a driver per downlight, and some way of setting up the addresses------14. What is a convex polyhedron?As other have said, a convex shape is one where the straight line connecting any two points is entirely within the shape.The Euler characteristic tells you something about the topological shape of the solid in question. By topological I mean you can distort things without changing the Euler characteristic, but no cutting or gluing. So a tetrahedron or a cube are essentially the same shape - you can make either out of a ball of putty just by flattening appropriate places - and have the same Euler characteristic. But if you imagine drilling a square hole through a cube, this would make a different type of solid - instead of a ball, it's sort of like a donut - and this has a different Euler characteristic (you should find $FV-E0$, not $2$)------15. Why does a LED light up in reverse direction at a DC generator worked by a falling objectYour diode is acting as a Flyback Diode, also called an "inductive kickback" diode.When current is flowing through the inductor (motor, generator, etc), a magnetic field is maintained. When the circuit is no longer excited the field collapses, which acts to oppose the change in current. This created a voltage spike ("inductive kick") on the previously-negative side of the inductor.The LED is the easiest path for current to flow, to alleviate the high voltage. What you are seeing is the inductive kick being snubbed by that LED.In electronics, any time you are switching an inductive load, you need to put these diodes in place. The kick can (and will) destroy transistors, MOSFETs, and even relays contacts. Usually you use a Schottky diode, because of the lower forward voltage. But then you can't see it light up :).