Can I Take Any Blue LED Lamp and Grow?or Are There Some LEDs Special for Growing?

I measured a few LED table lamp bulbs. The PF was 0.86. I also measured some CFLs, and the power factor was 0.901. Wiring an in-line on/off toggle switch on an LED lamp with additional controllers is not working as expectedYou can try to switch one of the wires on the other side of the control board, but you might end up in the same situation. The circuit that powers the control logic might depend on the any or all three of those wires going to the lights. If that's the case, trying to switch any of the wires might also cut power to the logic control. Since you do not know much about the electronics that control the light (and neither do we at this point), the quickest thing to do is try to switch the other wires and see what happens. You might be able to bypass the controller - just be prepared to get the same results as you have now2. Is it safe to remove the outer glass of an LED lamp?There is no problem with the UV light since the LEDs do not produce any. They are blue LEDs with a yellow scintillator to make white light. But the problem is with the high voltage that exists on the exposed wires. At 110 volts that can be dangerous. Each LED uses about 4 volts to run them off 110 volts they are put in series so the varoius wires in the bulb can have up to 110 volts on it. Tha can be dangerous3. What kind of inductive load does a mains LED lamp present?LEDs are a nonlinear load and probably these lamps will not have a power factor correction converter. This means that the current will not be sinusoidal therefore you will have some reactive power flowing. There may be a PFC choke before the rectifier bridge. If you want to measure the power factor and harmonic content just take a scope with voltage and current probes and measure line voltage and line current. PS. This it how you distinguish China Export mark from European CE:4. replace 250w halide lamp with led lamp?250W Halogen Equivalent? That's very bright, the brightness must be above 1500lm, and I do not know how much bright will 60W led bulb, maybe you could ask a pro for this5. Building a LED lamp, which is the brightest? 3 LEDs of 2500 mcd or 1 LED of 6000 mcd?In terms of overall light output then you just sum the mCd - it's just power. However if you want that light to do something useful then it's how much of the light can you focus on the target?A single LED at the focus of some reflector will put more of the light into the beam than a cluster of three - simply because all three can not be perfectly at the focus and some of the light from each member of the cluster will just hit one of the other LEDS.6. LED matrix dimming: How to control the current in a 12V LED lamp for video lighting?A potentiometer is also called a variable resistor and rheostat. Those 100 ballast resistors and the potentiometer are the same as a "Resistive dimmer". They will not damage an led. They are the simplest way to control the current to a led segment. Each of your 100 resistors are limiting current to ((12V - 1.35V - 1.35V) / 100)) 93 mA and dissipating 0.86W each (I hope they are 1W resistors, or they will heat up and fry quickly). Combined, that is 6.88W in heat for the resistors, and 744 mA. That's essentially a 12. 5 load. Since the leds are pretty low forward voltage, and the resistors are burning a very large amount in comparison (2.7V vs 9.3V), you have plenty of headroom to change the resistance. Increasing the resistance lowers the current, which in turn dims the leds. A single 10 5W resistor will (roughly) halve the current (51mA) and brightness to each led, and since it is also taking up 1/2 of the power, will help dissipate the heat nicely, as each of the 100 resistors will only be dissipating 0.44W instead of 0.86W. I saw 10 instead of 12.5, as a 10 will be easier to find. You could use a 20 for 35mA to each led string. Or a 5 for 66mA each. Since leds are logrithmic, it's not an exact scaling of brightness. Add a multi-throw switch, and you can chose between them.simulate this circuit - Schematic created using CircuitLabThe reason you fried your pot was that it could not handle your poorly designed panel. Frankly, you should have just stuck them all in series with a single resistor. 12V Source Voltage - 10. 8V Forward Voltage (1. 35 * 8) = 1. 2V to drop. 1. 2V / . 093A = 12. 9. 1. 2V * 0. 093A = 0. 111W. A single 13 1/4W resistor would have been perfect to set the upper limit and Most pots could handle a measly 1/4th1/8 Watt.simulate this circuit

My guess isThe LED lamp is using a switch-mode power supply, this means it will be regularly turning itself on (and allowing power through) for the fraction of a second needed to to supply the voltage and current the LED needs.This tiny amount of time and power is going to be virtually useless to an incandescent or florescent and so they'll remain unlit• Related QuestionsHow can I project a clear light shape on the wall with an LED lamp?Focusing the light requires some tinkering. The size of the hole is a factor. The distance between the light source and the apeture is another factor. Also, if you are using multiple LEDs then there will be multiple stars per hole; each LED will make a star.Some words to google might be diffraction, interferance, and apeture. Also you could perhaps pick up some info from making an eclipse viewer------Do i need a LED driver to drive 32 mosfets? closedHere are examples of 500mA constant current LED drivers. Looks like most need a PWM input to control dimming. If you paired these with SX1509 to create the PWM signals, that might do what you want digikey.com/product-detail/en/semtech-corporation/SX1509BIULTRT/SX1509BIULCT-ND/2295548------Does a lamp need a fuse? closedIncandesent lamps with coiled tungsten filaments can fail in a mode where the now open ends can touch a different mechanical part of the internal parts of the lamp, and in effect create a new much higher current, much lower resistance circuit. A fuse installed would blow to protect it's environment. The Smart, WiFi controlled LED lamp would/should not fail in such a way.------Brake/position LED LightsAfter searching around I try to cut it open this weekend and the result was a complex circuit for my understanding. I'm post it here if someone is interested to see or explain how it works.So I ended up removing the whole circuit and creating a simple circuit with resistors and 2 diode the classic old way and hope that the LED want burn quickly.------Lamp Test circuit for LEDs with an ArduinoThe most effective Lamp test is a momentary button, where you scan for an input to activate all, in firmware, or activate momentarily by some sequence on Power On Reset (POR) with no switch.Diode OR power switches may serve one purpose for a test in case of dead UC but then Design for Testability ought to be learned as quickly as possible by new designers. (Search DFT for system level)------Switch on off using triac BTA24, When off keep flashing LED lampYour Triac has excessive leakage and the LED AC_DC SMPS charges up and then discharges and repeats like a unijunction relaxation oscillator.Either reduce the leakage or reduce the load impedance to the LED with a 4W AC bulb (Xmas or chandelier light) or put an X-rated plastic film cap 0.022uF to 0.047uF in parallel with the LED or triac load output to shunt some leakage which may not be enough.------Integrating momentary switch with a Raspberry PiFrom page 16: A current-limiting resistor is built into the LED Lamp, so external resistance is not required.You have the A22NZ-BNM-TWA model, so 6VDC is needed.I'm assuming that since you are using this button you have 6VDC available. Since you can't drive 6VDC and any significant current with the RPis GPIO, you could do the following:simulate this circuit Schematic created using CircuitLab------Installing single-ended LED in a pre-existing T-8 fixture with only one connection per sideThe LED lamps you bought do not require the ballast you have in your photo.Remove the ballast.You will need to change the pin holders (tombstones). The lamps I bought came with new ones. But if these didn't you will need to buy some.Then take 120 volts, the black (hot) and the white (neutral) wire, directly to the power end of the LED lamp.Good luck and be careful!------Dimensioning smoothing capacitor for China DIY LED lampAs shown when comparing 38 and 60 LEDs, the "dropper" cap size affects the current capability of the circuit, so I recommend using one larger than the recommended for the 60 LEDs. Also, I would recommend a "smoothing cap of at least 47uf 400v, or as large as you can get and fit in the space available. I believe these changes will remove the flicker.The warning Russell posted cannot be overlooked------How do I prevent batteries from leaking?Batteries have greater leak risk the more they are discharged. You might do the following:Keep the item in a cool place.If the item has been used much, replace the batteries before storing even if they have charge remaining.Inspect the item at least yearly.Use reputable batteries since cheap batteries have greater long term leak risk.Do not store an item long term with recharged batteries------Limit of human eye flicker perception?If to consider computer monitors, to make the mouse cursor to move smoothly one have to make it no to skip pixels when moving. Since one can move the cursor from one corner to the other in about 1/2 second and the horizontal resolution is 1920 pixels on modern monitors, this gives us about 4000 Hz. Of course on better resolution it would require greater frequency to achieve maximum smoothness.------What happens with the current in a circuit that is not consumed by any device?A circuit can't draw 2 different value of current at the same time. If it draws 0.01A, There is no meaning in saying it draws 0.03A.If you provide a schematic we(the community) can help. Because your question is not clear.NB: You will come across superposition theorem, where you add current drawn from different sources at the same time to find actual value. But that's a different concept.------In what applications are lasers necessary vs. just convenient?It's true that laser's traditional applications are related to their monochromatic (one wavelength), collimated (one direction) and coherence ("one phase" or phase matching) characteristics. Laser beams have low dispersion, can be amplified and focused to reach very high photon densities and pulse shape can be sculpted at will.Many applications are only possible thanks to one or a combinaison of these characteristics. Here are some specialized applications using strong field lasers:------Can you install an LED floodlight in a regular ceiling fan?All lamps have a size designation which is stated in eights of an inch (1/8").That particular lamp will most likely not fit in your fixture if it is designed to take a standard A-lamp. That is an R30 size lamp which is 3-3/4" wide. An R20 style lamp (2-1/2" wide) would be more in line size wise with an A-lamp, which is actually an A-19------What exactly is a PAR type LED lamp, how does it differ from R/BR type LED & CFL lamps?This question came up recently for me in a different context. I found the best explanation in this document on PDF page 4, labeled as page 2 in the document: pdfEssentially, PAR is the only shape you can expect to efficiently reflect light. The others are generic shapes that are not likely to be efficient in lumen utilization------How to replace a LED driver with a plug-able power adapter?Just reducing the AC voltage supply using a resistor may not be enough to light the led lights. You may have to bridge the resistor with a suitable capacitor, a make and correct value to make the lights to work. I am not an expert but had seen circuits the way I described. May someone give the correct type of capacitor and its value for you to try.Aru------New light bulbs light up even when switched offThe first problem is probably the dimmer, you need a smart dimmer (they usually require a neutral) some lighted switches use neon lights in the switch, even these draw enough to light many types of LED lamps.There are some dimmers that are LED compatible that do not require a neutral. You need to find an LED compatible switch and everything will work the way it should.------Replace in-series incandescent lamps in a makeup mirror with LEDsInstead of using 24V lamps I would use 28V lamps if you stick with incandescent. #1873 comes into mind. But yes you can get ac rated led bulbs. and i would use the ones with the built in current limiting if you go that direction. They will state a wide range of operation (6 Volt-28 Volt AC/DC I've seen) but they cost quite a bit more (around 4GBP).------What is LED backlit display?This Wikipedia article is a good reference for Backlights.The advantages of LED backlighting in Flatpanel Displays What does LEDs have over any other backlighting source? The three most important concerns any Notebook designer has to resolve are power, even lighting, and weight. LEDs beat all other solutions hands down.LED backlight will apply additional pressure on OLED TV and Plasma TV The next step is thin-displays with Edge-LEDs (2)------Desk pictures lighting setupI can tell you how the shot you indicated should be realized looking at picture.the point 2 and 3 suggested that should be a close hard light (little emsitting surface) inline with the left raw probably and some sort of semitrasparent panel attached to it, so that the farest object (the bottom raw) are illuminated mostly by the bigger diffuser (smooth shadows) while the closest objects "feel" essentially the presence of the lamp------Appropriate BJT for car circuitryI don't get why the transistor is necessary, just use a couple of diodes:simulate this circuit Schematic created using CircuitLabWhen the low beam wire is on, only the low beam LEDs light up, when the hi beam wire is on, all LEDs light up (D4 is there to prevent backfeeding to the car system - my car would not care about that, but a newer car might)------AC circuit design and current flow closedAnswer to "Edit 1", switching the LED to an incandescent lamp. No, the lamp will light on every AC Cycle, there is no directionality that the lamp can see. You are talking about a series circuit, the same current flows through all elements equally, and since the resistor and lamp are both pure resistances (not semiconductors), the lamp will light as long as sufficient current passes through it (no matter the 'direction').------Is it safe to use a 100 watt LED bulb in a 3-way lamp that specifies using incandescent bulbs only?In general yes. Use an LED bulb that is marked 'dimmable', and do not use it in an enclosed glass fixture -- many of the bulbs are made of plastic and can melt.Also, look for a bulb that has more even light distribution; older bulbs often had the LED elements on a rectangular bar that created 'stripes' of higher and lower intensity light, all of which looks terrible in a lamp------LED Dimmer only using NPN BJT and potentiometerAll these circuits are highly inefficient and will give low life to batteries and LEDs. Rather use a PWM scheme that drives them at constant voltage and current but variable duty cycle (from 0 to nearly 100%). There are many circuits on the net for that, one can be based on the 555 timer. One, I dont take credit for it, you can find here------Will a 110-220v to 12v converter work with a DC 12v 3w LED bulb? closedAll you have to do is read the specs for the two things you show. The LED lamps require 12 V, so that matches. They are rated at 3 W, so the current is (3 W)/(12 V) 250 mA. That power supply can put out 350 mA, so one of them can power one lamp with some margin. Again, this was all directly available in the data you linked to------Preventing LED micro flickerMany LED drivers (most?) cause flicker because they use PWM to control current through the LEDs.What you are looking for is a 'precision current source'. Without knowing more about your application, it would be hard to recommend something specific, however, the internet is full of examples you can learn from.A simple regulator, such at the LT3083, could make a fine precision current source------Why must resistors be on the respective anode terminals instead of the common cathode terminal of a RGB LED?The red led will hog all the current because it might only need 2 volts across it to begin conducting. The green and blue LEDs need a higher voltage but because they are all in parallel the red led dominates. Try measuring their respective volt drops when each operates.It's like putting a 5 volt zener in parallel with a 10 volt zener. The 10 volt zener will never conduct------2N7000 driver circuit Raspberry PiIf your load is located 20 meters from 2N7000 switch (as the comment says), the problem is in wire inductance.A 20-m wire has self-inductance of about 50 mH. When the N-FET turns OFF, there will be spikes of voltage with kV-level amplitude, which will kill the FET. You need to use a clamping diode, as it is normally used when controlling coils of electromechanical relays

This is a halogen light. Such lights are usually powered by a bottle dynamo. That is a small electric generator that is driven by the front or the rear wheel. There is usually no switch. One simply engages the dynamo by pushing it down, such that a spring presses it against the flank of the tyre.Some bikes have a hub dynamo instead. In this case there might be a small switch at each light. A hub dynamo looks like a very large front hub (central part of the wheel).If you have such a dynamo make sure that the light is connected to it. Follow the wires from the lamp to the dynamo. On older bicycles with bottle dynamos there is typically only one wire. The bicycle frame serves as common ground connection.Check if the dynamo is properly pushed to the tyre and that its wheel spins when you spin the tyre.The bulb in the lamp might be defective or missing. Replacement bulbs are not very expensive. But they may be hard to find today. An inexpensive led lamp might be a better replacement, as such lamps are considerably brighter.Finding the fault may be a little tricky without a volt meter or other means to test electrical connections. If you cannot got to a bike shop anyone who is handy with simple electrics may help you out. For example, electricians or car mechanicsI've been doing a lot more cycling in the last year since moving to a new town and have really enjoyed it.I had a fairly crappy bike though and went to a secondhand store quite far away to get a good bike at a nice price.One big issues is there is what I assume is the bike light in front of it (just one) but I see no way to get it to actually turn on, which means I can barely cycle now.I used to have the lights where you move that part down to touch the wheel and the movement causes the light to go on (best way I can explain it). This doesn't do that. I also don't see any on/off button or basically any obvious way to get it to work. The store I bought is really far away as are the good bike stores (I live in a small town.)I've started to wonder if it's really a light or a reflector - although it looks like the former. Any help please?