General > General Technical Chat
Help!! I don't feel like doing anything
Distelzombie:
I wouldn't trust these bulbs. Who knows if they do emit UVC or not. They are not sold for humans, mind you.
Also, it can damage your eyes if you have UVB shining in them all the time. That's why all the sunglasses, normal glasses and windows block it. So 10 minutes would be fine.
I actually got one of these tanning devices from my grandma. It uses proper Philips fluorescent tubes, but six of them. They're really bright. :/
You need a spectrograph, a spectrometer or a spectroscope. There are very cheap ones that you have to assemble yourself. They work quite good! I have one of these: https://www.grand-illusions.com/hand-spectroscope-kit-c2x21140017
It's +/- 5nm. Those plastic-boxes for under 10$ you find on amazon are way worse, due to their big slit.
Red Squirrel:
Oh yeah would not want that bulb to hit my eyes. I would probably build a fixture around it so it it is very directional. Maybe even wear shades when using it, to be on the safe side. (diffused light from surfaces? Not sure if UV would bounce too though) Figure it's worth a shot. Though it will be kinda hard to know if it's even doing anything, as I'll be taking supplements too. So it's probably going to be placebo more than anything.
Might check out those spectrometers, will they do UV too though or just visible light? Looks like it's basically using a prism inside?
Distelzombie:
If you can see UV light with your eyes, yes they will also do UV. :)
No, you need some sort of image capturing/processing device for that.......... ooh.... I just thought about something: If you coat the surface near the nm-scale with UV-fluorescent paint or use something flourescent, you can see the UV spectrum with it. But the scale doesn't go so far and maybe it isn't linear anymore, so you can't just add to it..
I'll try and put something fluorescent in mine then take a picture. Could be cool! I got a 365nm led that definitely isn't visible usually.
Here are some other photos I took with that spectrometer and my phone:
(Translation:
1. White, cold cathode tube light from a scanner
2. LED-TV Backlight
3. Energy-saving bulb
4. White fluorescence with 405nm laser
5. 365nm UV LED is without fluorescent material, just visible by the camera itself. I think it can't see down to 365nm though, given it looks more like a peak at 380nm, and you can't see it with your eyes either.)
CopperCone:
get rid of chinese electronics around the home to promote a cheerful atmosphere
how a 0.02$ transistor has higher quality then a 30$ laser diode i will never know.
james_s:
Those SAD lights are a ripoff, I had a boss who had one of those in her office and I looked at it, it's nothing more than a bog standard $3 Daylight 6500K CFL in a fancy housing.
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