These are very bright LEDs. The LEDs are so bright that it hurts to look directly at them. Please take a look at the pictures to get an idea of the intensity. All lenses are clear.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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Has anyone ever measured the number of lumens output by these?
Also, what would the ideal power supply be?
Sorry if this is a silly question but what resistor would I need for this?
The maximum current for these resistors is 20mA, so you will need a resistor that drops the current to under 20mA. Check out this tutorial on calculating the resistor. Usually we use 330 ohm resistors around here with 5V circuits which gives plenty of margin. As for a power supply that depends on what you are trying to do and is usually more dependent on the rest of your circuit. If you are just powering a few LEDs you can use a coin cell battery (the Lilypad Battery Holder is a good option). If you are doing more I'd look into 5V wall warts, Lithium ion batteries, or a USB power source since it is a pretty steady 5V source. You can also look into AA or AAA batteries, but since they are only 1.5V each you will probably want at least 2 or some sort of boost circuit.
Hello.are those leds suitable to be used as brake light for a car?(10-15 leds)
Ate these the LEDs used in the 5v - 3.3v powe supply kit???
Yes, this is the LED used in that kit.
Excuse my spelling
Great LEDs, I used them for my science project. I was trying to figure out which part of the visible light spectrum was best for growing plants, and these did the trick. I found that the blue worked the best. My only complaint, though, is that they are clear, and don't come with any description out of the box, which means you cannot immediatley identify what color they are out of the package. You have to light them up, and then organize them. No biggie though. Great LEDs and very bright when running off 3.6 volts. Also very energy efficient, I had 8 of these running off of two AA for a grand total of over 200 hours, and did not drain the battery very much.
Man I can't even afford to provide one tech freedom fighter with an ample amount of these at $,95 each. Voy a luchar para dar mi pueblo, los productos electrónicos asequibles misma calidad.
"¡Hasta la Victoria Siempre!
Check the recommended products section, we also sell these in 25 and 100 packs for a bit cheaper.
I am building a led light panel to be used as a softbox for my home photo studio. I am needing a lot of super bright LED's. I do realize It will take MANY LED's to complete the panel. I need other opinons as to this being the LED I need or is there a better brighter LED that I should consider for this project. Has anyone ever built one or something similar? If so are there specs, tutorials, or schematics somewhere online? I do have an electronics background as a service technician, not an Engineer so I don't think I will have any problem with the build. Thank you all in advance.
While I don't have any specific suggestions for an LED, given that you are building a softbox, one thing to keep in mind is that the LEDs on this product page have a very, very narrow viewing angle (spikes from the optics aside). According to the datasheet, the 50% intensity angle is at 10° (see also the last product picture). Ideally you'd want that to be as wide as possible, so that you have to do as little as possible on trying to diffuse that out. If you've got some nice diffusers or some leftover lambertian reflectors you could try pointing the LEDs in the other direction and letting the bounced light illuminate the scene. That should be fairly diffuse, though you'll always lose a chunk of the original brightness that was constrained to that 10° angle (one common way the numbers 'cheat' you).
Alternatives would be to use diffused LEDs - but they tend to be fairly weak, or SMD LEDs - unless they're lensed, they have an almost 180° spread. The very small ones tend to be fairly weak as well, though - and they're not super user-friendly. The https://www.sparkfun.com/products/12015 on the other hand, is. It doesn't say how bright that is, so might want to ask there if that product piques your interest. And, if it does, you may also want to check out the white version (can always use gels to give it whatever color you like), or even things like the RGB LED strips or, even more bang-for-the-buck, the https://www.sparkfun.com/products/12661 so that you can change the color on the fly. You'd have to mount those relatively close to the front cloth simply because they take up more space than a few 5mm LEDs together. Lastly, there's the Triple Output High Power RGB LED. These are very bright, have a wide angle, and are relatively small so that they should fit in the back of the cone.. where you'll want to mount a heatsink as these things do tend to get rather hot.
I got the red and green "Super Bright" LEDs and some light pipe for some x-mass crafting. The Red LEDs didn't compare with the green however. Didn't make a difference if I was using 6V or 3V, the red was weak. The green met my expectations however. I wouldn't say the red is 3/4 the mcd of the green... (9000/12000 mcd)
On page 2 of the datasheet there is semicircular graph depicting viewing angle. I didn't see any kind of units for the curves that range from 100-0-100 in increments of 25. Can anyone clarify what units are being used? The way I read that figure is the viewing angle changes depending on your distance from the led with 50 "somethings" yielding a 20* viewing angle. Is this cm, m or other? Thanks!
It's a rudimentary photometric diagram which, admittedly, does lack the exact information you seek. However, the measurement along the horizontal axis (which is the same along the semicircle arcs) is the luminous intensity.
The 'viewing angle' is always the same and is typically given as the angle at which only 50% of the maximum luminous intensity is apparent - excluding any outlier 'spikes' due to optics used. For example, in this image - http://www.electron.com/images/watermarked/detailed/0/530AG7C.jpg - you'll see a 'spike' at wide angles, but the 'viewing angle' will still be given based on the more narrow main 'beam'. ( edit: actually, might as well use the shot of this very LED we're discussing: https://dlnmh9ip6v2uc.cloudfront.net/images/products/5/2/8/00528-LED_Light.jpg )
Instead, the line through the diagram tells you the luminous intensity at that viewing angle. So in the diagram in question, straight out of the lens it is at 100 'something', while at a 10 degree angle (either which way and assumed to be radially symmetric) it is 50 'something'. From that, in combination with the 'viewing angle' being specified as 10 degrees, it seems reasonable to conclude that what they meant is a percentage. What it is a percentage of (e.g. whether the 9cd figure is total/OTF or peak or...) I can't readily surmise from the datasheet (I might have glossed over it too quickly, though).
In case you followed that link to photometric diagram, looked at the datasheet, and looked at the example image and thought "that looks like it's almost useless" - you'd be right. Even architects will much prefer an actual image of a light+fixture's illumination pattern (say, for sconces) than rely on a photometric diagram file (be that IES, EULUMDAT or any other inherently incorrect format)... but they are ubiquitous and we'll be stuck with them for a long time :)
Wow, ^^^^ that's an answer. Thanks for the info and anticipating the follow up. =)
Why does the data sheet say that all of the led colors use 3.2 - 3.4 volts when this one is rated at 2.4 volts.
Red LEDs generally have a lower forward voltage, but more draw current. Just follow the datasheet, and you'll be ok.
It has to do with the physical properties of silicon and how they are excited to emit light. I believe red is in the 2.0-2.4 range, next is green in the low threes, and blue in the mid 3 volt range. Every LED is different. Please do follow the datasheet.
No idea. Different series maybe?