| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| dhaffnersr | "It's me again Jeff, Dave H, sorry I posted the wrong graph i made, this is the right one " | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff, I use spekwin32 for all my spectral data processing, first here are 2 references that may help you https://www.researchgate.net/topic/uv..." | Read more » | about 8 years ago | |||
| warren | "Hi, Dave - what is the tell-tale hump? Do you mean from the LED input light? If so, it's at 398nm, not 385nm. What processing did you do? " | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff, I saw your spectra of the nail polish machine and there it is the tell tail "hump," so I exported it and processed it and here is what it..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Dave, well I was thinking along the lines of when I built a wind speed indicator with a small dc motor and LCD screen attached and calibrated i..." | Read more » | about 8 years ago | |||
| stoft | "Unfortunately, LED wavelength does not change with applied voltage or current -- their center peak wavelength is not variable or controllable and P..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff! Sure I'd be happy to test any LEDs you want to send. I do want to throw an idea your way, I think using the higher wavelength LEDs are st..." | Read more » | about 8 years ago | |||
| stoft | "Sure ... what's the LED's packaging style/type? SMD, leaded, ...? " | Read more » | about 8 years ago | |||
| warren | "@dhaffnersr and @stoft, if you'd like I could send you the lower-wavelength LEDs as well for comparison testing? " | Read more » | about 8 years ago | |||
| warren | "@briandegger @jeffh - thanks for the tips on LED sourcing! Thought you'd enjoy seeing this. " | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff, I thought I had some high brightness LED's, I can't find them right now but I did have a RED LED clear top 1.7v@20mA 3000mcd@ 12deg viewi..." | Read more » | about 8 years ago | |||
| warren | "Ok, this is getting a little out there, but I'm going to buy and try a few other products; I see $3.84: http://www.ebay.com/itm/201481504603 $3..." | Read more » | about 8 years ago | |||
| warren | "Mouser has that one! http://www.mouser.com/ProductDetail/Lite-On/LTPL-C034UVH365/?qs=pPiH5vUCJeR2s22VxlBhsw== I think I should order it. I can sol..." | Read more » | about 8 years ago | |||
| warren | "The 365nm might get us clear data above 410nm -- possibly better than the laser! " | Read more » | about 8 years ago | |||
| warren | "Hmm, i looked on DigiKey and found some more options, some high brightness, and one listed as 365nm, which'd be great: http://www.digikey.com/shor..." | Read more » | about 8 years ago | |||
| dhaffnersr | "here is a picture of a 3W LED mounted on a heatsink and an optional focal lens, this LED's wavelength is 410nm-465nm. 11401.Jpg 13779.Jpg " | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff, yeah that's an ultra-brite LED (high current/high-flux output.) it's just mounted on a heat sink assmbly. I have a few of those, but the..." | Read more » | about 8 years ago | |||
| warren | "Ah, excellent, excellent, but it's my understanding that the plastic LEDs like that aren't typically as bright as the surface mounted flat LEDs I'm..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Here is where you can buy 395nm UV LED's for $1.40 a piece. http://www.allelectronics.com/make-a-store/item/uled-2/ultraviolet-led-395-nm-30-degre..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Here is the Peak and FWHM data for both the 395nm and 405nm readings: PEAK DATA UV laser 405nm 1) Isopropyl alcohol wavelength [nm] absorbance ..." | Read more » | about 8 years ago | |||
| dhaffnersr | "Hey Jeff, glad you found this useful, I believe the baseline noise is caused by the extra cell length (the glass test tubes are 2.05cm.) I am waiti..." | Read more » | about 8 years ago | |||
| warren | "Oh i see here from your post to the list: https://spectralworkbench.org/sets/3176 UV flashlight 395nm baselines feb23 using .09mm slit https://sp..." | Read more » | about 8 years ago | |||
| warren | "Very consistent results, too, BTW! Although i see there is a change in baseline noise between your two laser tests. " | Read more » | about 8 years ago | |||
| warren | "Ha, this is great to see! I looked at the graph and my very first thought was "that doesn't look like a 405nm LED, it looks like a 395nm LED". And..." | Read more » | about 8 years ago |