| 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 » | over 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 » | over 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 » | over 8 years ago | |||
| dhaffnersr | "Hey @ethanbass, more so, I mean modulating the intensity by means of PWM, although there is a temperature wave length correlation in LEDs, example:..." | Read more » | over 8 years ago | |||
| ethanbass | "@dhaffnersr - I'm curious, what do you mean by a "variable LED to control wavelength"? " | Read more » | over 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 » | over 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 » | over 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 » | over 8 years ago | |||
| dhaffnersr | "dave stoft did a great analysis with different oils https://publiclab.org/notes/stoft/01-26-2016/otk-proto3-analysis and to me it seems to concure..." | Read more » | over 8 years ago | |||
| dhaffnersr | "Hey Jeff, unfortunately with refined oil the organic chemistry aspect gets changed dramatically, thats why when you shine a UV flashlight or laser ..." | Read more » | over 8 years ago | |||
| dhaffnersr | "Correction for graph number 2, it says :"data from March 9th" it should say:"data from March 10th" sorry " | Read more » | over 8 years ago | |||
| warren | "Hmm, Dave, it's odd, but it doesn't seem to me that you're seeing any fluorescence -- do you see any, visibly? Do you normally, with this setup and..." | Read more » | over 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 » | over 8 years ago | |||
| stoft | "Sure ... what's the LED's packaging style/type? SMD, leaded, ...? " | Read more » | over 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 » | over 8 years ago | |||
| warren | "@briandegger @jeffh - thanks for the tips on LED sourcing! Thought you'd enjoy seeing this. " | Read more » | over 8 years ago |