MF1 0. MD3 25 mW Min. ML5 25 mW Min. MD3 53 mW Min. ML4 53 mW Min. MF3 1. MD2 mW Min. ML3 mW Min. MFP1 Chrolis mW. LIUA 31 mW. MLP1 mW Min. LEDL 1 mW. MD4 mW Min. ML4 mW Min. MF2 4. LEDE 2. LEDL 5 mW. MD1 mW Min. ML2 mW Min. MF1 LEDL 6 mW. MD3 mW Min. MF3 6. ML5 mW Min. MF1 3. LEDE 10 mW. MF3 LEDL 8 mW. ML5 MF1 7. LEDL 7 mW. LEDS mW. LEDE 20 mW. LEDL mW. EPS04 18 mW Min. MD4 mW Min d. ML5 mW Min d. LIUA mW. EPS10 mW Min. LEDL 3 mW. MF3 3. LEDL 4 mW. MF2 9. LEDL 2. LEDL 0. LEDL 2 mW.
EPS04 3. MF3 4. LEDE 2 mW. EPS10 18 mW Min. MF2 LEDL 12 mW. LEDL 16 mW. LEDE 4 mW. LEDE 7. LEDL 13 mW.
MF3 2. EPS04 5 mW Min. MD2 80 mW Min. ML4 80 mW Min. EPS10 30 mW Min. MF2 6. LEDL 18 mW. LEDL 24 mW. LEDL 22 mW. LEDE 18 mW. MF2 7. Chrolis 40 mW. LEDL 20 mW. Thank you very much for your inquiry. An Excel file with the spectral data can be downloaded from our website, by calling up the information of the desired LEDs in the info column.
Good morning, Do you have an other reference to propose? This is a response from Michael at Thorlabs. They list the diameter as " Thank you very much for this information. That is correct. We will correct it immediately. This is a response from Wolfgang at Thorlabs. Thank you very much for your inquiry! I will contact you directly regarding these files. In the website you also show a ML4 with very good output power. I am interested in this product, but I only find the ML3 in the ordering section.
How is it possible to order thise ML4 version? Thank you Best regards Bernd Polder. A response from Laurie at Thorlabs to Bernd: I will reach out to you via email concerning your inquiry to purchase our next generation nm LED, for which we had accidentally posted some information ahead of the formal release.
Hello, We would like to inquire about your product ML3 certification. We are using your product and we need your product certificate to be certified for the product we are developing. I am writing to ask you this question because I cannot see Rohs certificate on your homepage.
I would appreciate it if you could send me my email with the certificate for ML3. Thank you. In general you can find the RoHs certificates on our website for the respective articles. If you click on the red icon in the column 'Documents' on the product page where the article number is listed, you can download the certificates.
I am using the ML3 with dc driver but can not get short pulses, what are the rise and fall times of ML3? Hello Rafael, Thank you for your request. I am reaching out to you in order to give you further support. Hello- I need to time a camera trigger after turning on your LED, but I could not find and spec for LED rise time in yoru documentation on the web site.
Thank you for your assistance. This is a response from Nicola at Thorlabs. We do not specify rise and fall times of LEDs, but typical values are in the ns range. The rise and fall times of LED systems are, however, limited by the driver electronics in most cases. I have however looked at the data sheet of this LED chip and the ML3 seems to be quite similar in performance. I will contact you directly to discuss your requirements in detail. What is the approximative spot size of the collimated beam at mm distance using the SM2F32 Adjustable Collimation Adapter?
I will perform a Zemax simulation with the ML3 in combination with the adjustable collimator to determine the divergence angle and thus the resulting beam diameter at a distance of mm.
I will send you the results directly. Thank you for your inquiry! Please contact your local Tech Support Team if you need specific information about the characteristics of the chip. Will a diffuse condenser lens have much effect on its collimation compared to a clear one?
The quality of the collimation, i. The diffuser smoothens the intensity distribution of the beam and makes it more homogeneous. It will also smoothen the edge of the beam a bit so the beam would look a bit wider.
The main disadvantage of a diffuser is that the transmitted power would be lower than without a diffuser due to absorption and reflection. To reach the specified minimum output power of mW, you would need to apply a higher current than LEDD1B can provide.
I therefore recommend using DC as driver. Unfortunately, we do not have Zemax files for these two LEDs. I will, however, send you ray files and an instruction on how to load them into Zemax. Thank you for your inquiry. Unfortunately, we specify our LEDs by means of radiometric measures only. I will contact you directly to provide assistance for the conversion into photometric units. Hello, thank you for contacting Thorlabs.
And I want to know the best distance between the LED and the lens. Thank you! This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The selection look adequate for collimating the ML3.
Basically the distance of the lens to the LED should be the back focal length. The best distance between LED and lens depends on the optical path in your microscope. I recommend to start with the back focal length and optimize the distance until you get best results.
I contacted you directly for assistance. Hi, we are going to buy ML3 from Thorlabs, we would like to know the spatial and temporal coherence length of this diode. The spatial coherence for LEDs is typically very small. We do not test the spatial- or temporal coherence for our LEDs so we can not provide specific data. I contacted you directly for further assistance. Is it a continuous wave on all the time? We recommend to use current sources like switching drivers e.
I will contact you directly for further assistance. Yes, it is possible to couple this LED to a multimode fiber or a light guide. We don't have a ready-to-use product for this, but you can use Thorlabs' components for the coupling. I have contacted you directly to discuss your application and the necessary components in more detail. Hi, I see high frequency fluctuations on the flux output generated by the LED at nm.
Fluctuations appear at the level of the kHz: we sample our signals at about 1. Are you aware of a feature of the controller or the LED driver or of the LED electronics which would be related to this effect?
I will contact you directly to discuss this issue in further detail so we can find the reason for these power drops. These LEDs are tested during production to ensure that they work properly and that they emit the specified power. But unfortunately they cannot be calibrated.
I have contacted you directly to discuss your requirements. For modulation at frequencies above 1 kHz, the duty cycle may be reduced. The broadband emission is luminescence generated by Phosphor. So would it be better to use a 1" lens to collimate the LED as described below, rather than the product specified for the olympus microscope, and how would I fix this to the microscope, do you sell the olympus adapter without a lens?
Should you need to use the 1" LED collimators, you would need an SM2T2 and we can provide the corresponding 2" adapter without the lens inside. Very pleased with your offering a 2" adjuster. From my first observations, it seems it may be related to the environment conditions temperature, humidity. Would it be possible you provide your customers with the proper working environment conditions for the SM2P50 and SM1P25? I have contacted you and provided a detail report of my observations but only received a proposition from Thorlabs application engineer Yi-Ma to change the parts in question.
This offer doesn't seem to address my question nor would it help if the replacements have the same issue. We will check to see if we can replicate your observations regarding SM2P50 and SM1P25 performance under various humidity conditions.
I will be in touch via email. Would it be possible to purchase the extra-thick SM1-threaded and SM2-threaded retaining rings for Aspheric condenser lenses separately?
I use the 1" and 2" diameter aspheric condensers fairly often, and the regular retaining rings don't work well with them. This is a response from Stefan at Thorlabs. Thank you very much for your feedback. We have contacted you directly to offer you these retaining rings separately. Dear I would like to use your module ML3 with your Adjustable Collimation Adapter ACPA, but I also would like to know how much power is lost after of the collimation step because I want to focus the collimated beam and make a filtering using a pinhole Juan.
I just tested this, the output power of the ML3 without collimator attached measured with an integrating sphere was mW. I will contact you directly to discuss your application in detail. Since ThorLabs sells an adjustable 1" lens tube SM1V10 this seems rather redundant, unless the thread inside the LED casing does not allow it to collimate. If this is the case, I suggest you extend the thread on the LED case, if possible, to simplify the process.
Kind regards, Sam S. Response from Mike at Thorlabs: Thank you for your feedback. The thread depth for these LEDs is 6 mm. Based on this feedback we have added this information to the Overview tab of the web page. However, the current recommendation allows for a slightly longer translation range of the optic due to the 7. Dear Sirs, I would like to have information about the dependence between the emitted power versus the LED driving current.
Is this relationship linear? Best regards, Carlo. In this range you will see a linear relationship, however we have no information how this relationship changes in the range from mA to mA. We have tested this LED only at mA as this is the maximum drive current our heat sink system can also manage. I hope this information helps you further, please let me know if there is anything else you need.
We have our own assembly and thermal film bonding process. This is a response from Thomas at Thorlabs. We will contact you directly with a quotation. I could not quite identify which LED is actuall mounted. Thank you in advance for your help! Kind regards, Jan Ellinghaus. We do have Zemax files available and i will contact you directly with more detailed information. We are using it as a BIAS illumination source in a measurement setup.
Is it in any way affecting the current supply of the LED? In particular, is it possible that it creates some noise on the current supplying the LED? Best regards, Jan Haschke. This way a current overload can be avoided. I will contact you directly with more detailed information.
A response form julien at Thorlabs: Than you for pointing this out. We corrected the presentation on our website so that now the wrench recommended is the SPW We will send you a replacement for the lens together with the new case. One other thing: On the application page where it explains how to collimate the LED, it says to use a SPW spanner wrench to secure the aspheric lens with one retaining ring on each side.
I did this, and the SPW carved a circle on the front surface of the lens. Please change this text to instruct people to use a different spanner, so they don't inadvertently scratch their collimating lens. Hi: I have a minor issue to relay about the packaging of the mounted LEDs.
I bought an ML3 late last week and received it today. The plastic case it comes in is not well designed or built. Specifically, the red latch on front broke off while I was trying to figure out how to open the case.
And it took two of the black plastic hinge-posts with it, so even when I put the latch back on the case, the case won't stay shut anymore. It seems silly to provide these in a hard shell case if the latch can't withstand a bit of force from a novice case-opener. Response from Jeremy at Thorlabs: Is your power supply a voltage source or is it a current source? It is highly recommended that you drive these LEDs with a current source instead.
If you used a 5V constant voltage source 3A , then you will most likely be injecting 3A of current into this LED and thus destroyed it max.
It could also be that you have not connected this correctly. I will get in contact with you directly to check on the details on your setup. I control it by a DC power supply. Am I doing something wrong? Response from Jeremy at Thorlabs: We do not have a precise number for this, but based on some old data, the rise and fall times are both on the order of 20ns or so. Hello Thorlabs. I am using the nm LED and I need to know its on-off switching time, particularly its off time i.
Even if this is not known precisely, as order of magnitude value would be very useful. The curve displayed on our website is aimed at showing the effect of long term thermal stabilization, ie.
Should the thermal exchange channel be poor, it can be that the temperature of the LED will settle at a too high temperature, which would lead to the situation displayed by the curve "LED with poor thermal management".
Therefore, the following calculation gives us the value of the base resistor. These calculations are an approximation to keep everything simple. In practice, the transistor will exhibit a small voltage drop of around 0. These factors are negligible and taken into consideration when designing high-end audio amplifier, however for blinking LEDs and driving relay coils it is good enough. The components are on Google and easily found.
They are usually at the top of the search listings. Driver Transistor. Raspberry Pi Projects Donate. Q2 limits the circuit in two ways: 1 power dissipation. Q2 acts as a variable resistor, stepping down the voltage from the power supply to match the need of the LED's.
Now what? This circuit lets you have an adjustable-brightness, but without using a microcontroller. It's fully analog! The main difference is that the NFET is replaced with a voltage regulator. The current-limit circuit works the same way as before, in this case it reduces the resistance across R2, lowering the output of the voltage regulator. This circuit lets you set the voltage on the LED's to any value using a dial or slider, but it also limits the LED current as before so you can't turn the dial past the safe point.
Compared to the previous "simple current source" using two transistors, this circuit has: - even fewer parts. I'm embarrassed to say i did not think of this method myself, i learned of it when i disassembled a flashlight that had a high brightnesss LED inside it. Although simple, this method has some drawbacks: - Your driving voltage can only be slightly higher than the LED "on" voltage. This is because PTC fuses are not designed for getting rid of a lot of heat so you need to keep the dropped voltage across the PTC fairly low.
PTC fuses do not have a very accurate "trip" current. Typically they vary by a factor of 2 from the rated trip point. The only safe choice of PTC is a bit under-rated. Connect in series with a PTC rated about mA. Driving voltage should be about 4.
Question 11 months ago on Step Answer 10 months ago. First if your are driving 32 LEDS in series then you would need at least a 22 volt source considering 0. In series the current would be the same at 20 ma. Adding in the drop for the current sense would increase the supply voltage. If you were to wire them in parallel then you would need to supply the ma. Some of the phone chargers are constant current devices so that may not work.
Biggest problem I see is getting the low value correct current sense resistor to carry the current. That's one of the best articles I read about constant current drivers. All solution I was finding through the web in one post. Thank you very much for the time and effort :.
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