WTS: Genuine 365nm Nichia NCSU033B UV leds

Djozz, cant you send me some translucent S2+ thingies, and i will send you one of these :slight_smile:

That is too good a deal because I got those for free from Simon. But send me your address and you will get some anyway. (and that reminds me that someone else asked for a few of those as well, so I will have some shipping to do :slight_smile: )

I just got mine today. Very fast shipping! Thanks!

djozz, PM sent. Iā€™ve ordered some S2+ hosts from GB for modding. Feel free to ship away any S2+ parts you donā€™t want to keep :smiley:

The_Driver, wow that was indeed fast. Any plans on how you are going to mount the LED into your host? Iā€™ve modded a 348 with one of these where I just soldered the LED to a rectangular copper bar 2x3x6mm and then glued to the pillā€¦

Iā€™ve got some more playing to do with these today. Any wishes what one should do to a de-domed or, should I say ā€œde-windowedā€ UV led? :smiling_imp:

Forgot to annotate the photo.
The small die on the anode side is apparently the ESD/TVS protection diode. That fella ensures that this expensive diode does not get zapped by the static. Ainā€™t that sweetā€¦

Thanks Valor, I will get you a few nice emitters for your S2+ :slight_smile:

This will soon need itā€™s own separate thread :slight_smile:
Iā€™ve had some time to prepare a test of the same led at 1700mA and leave it running overnight. The thermal performance looks very promising.
Iā€™ve then had the led running at 2000mA for an hour and it stabilized at 79Ā°C. Thatā€™s at 285% of datasheet figures.

The power usage seemed to remain uniform despite running warmer.

Voltage and current has been logged via an Agilent 34970A data acquisition unit. Iā€™ve ordered a set of Omega K-type thermocouple to cover temerature in the logged dataā€¦

No visual deterioration either

Mine arrived yesterday, thanks for yor fast shipping!

That graph screems for added output data. I will see if I can add that (but no promises because it is hobby :wink: ).

Cool. It was primarily done so that I donā€™t miss the burn-down moment. But luckily the led coped with it well.

A friend promised to lend me an industrial UV power meter sometime next week. I hope to do some absolute irradiance (W/cm2) measurements for stock as well as ā€œoverdriveā€ currents.
No need for you to risk your LED outside its specs :wink:

Doing measurements with an actual UV power meter is way cool! Looking forward to that. :slight_smile:

Finally received two EIT SpotCure UV Intensity Meters and figured I need a way to collimate the light in order to make accurate readings.

After some experimenting I decided to go forward with a simpler setup: mounted a 18mm reflector (laying around) and centered with some rubber o-rings. I hope this way I can minimize the spill.

The measurements are now relatively consistent within few counts, based how I align the flashlight.
The UV meter has a large ā€œStartā€ button which has to be pressed while measuring. Releasing the button stops the process and keeps the screen on, showing the latest reading for 3 minutes. Iā€™ve modded one of the meters for a ā€œcontinuousā€ reading to make the measurement easierā€¦ :smiley:

Since these meters measure the irradiance, the unit for the readings is Watts/cmĀ². Iā€™ve yet to find a way to convert these into a ballpark raw power in Watts before we can compare the measured output to the values advertised in the datasheet.

Hereā€™s a reading out of a new & freshly modded Convoy S2+ with one of my LEDs mounted on a 16mm aluminium XHP50/XHP70 base, and the glass replaced with 2mm ZBW2 filter. The measurement is done with the stock driver set to the ā€œHIGHā€ setting.

Some more statistics to followā€¦

Finally some more data :slight_smile:
Here are some irradiance measurements with and without ZBW2 filter.

The ā€œstartā€ of the measurement shows the instantaneous reading, the ā€œendā€ is the reading once the output of the LED&flashlight stabilized (3-5 seconds)

We have our first martyr in our researchā€¦
This one was mounted on a 20mm alu. MCPCB, zapped at 4.5-5A pulse

Cool picture! I feel sorry for the led.

Do you have any further data on up to which current it did survive?

And the S2+ driver was a 2.8A lineair driver?

Was the MCPCB a non-DTP board?

I have not played with the led I got from you, but look forward to make a nice mod with it (will try an output test as well)

Thanks djozz,

I am still waiting for me new Omega temperature probes plus I ordered a wideband photodiodeā€¦

Once the new data acquisition setup is ready for loging temperature and relative power output I will proceed with overdrive testing. The absolute irradiance reading will be taken manually at certain steps.

The S2+ host is with a 2.1A linear driver (6x7135). I will probably use an S2+ head (driverless pill, reflector and the stock glass) for the mensioned test. This might be esier to work with and will provide OTF measurements

The dead diode was on a non-DTP aluminium board free-hanging in the air :smiley:

Retook the photo with a new lens and an extension tube :sunglasses:

Iā€™ve got your parcel with the high CRI and UV leds today. Special thanks for the Lite-On 365nm.
A few more S2+ flashlights are on their way, one of them will host this Lite-On. It would be nice to have it for a comparison.

Val

Bump

I finally used mine. I put it in the Convoy S2+ (mine was actually the UV variant) mounted on a 16mm Sinkpad for XM-L (5050) LEDs. It doesnā€™t fit perfectly, but it centered nicely after a few tries with lots of added flux. Vinz also did this here. Unfortunateley I had to file the edges of the pcb and also enlarge the hole of the reflector.

Now it works and I am driving it at 700mA. The host becomes warm to the touch after 2-3min. It could probably tolerate 1A, but I wouldnā€™t go much higher than that.

That one thing I still want to do is sand the glass to make the beam more floody. The small die turns the S2+ into a thrower with a tiny spot.