I’ve already have two LED light bulbs with no enough manufacturer data on the UV and blue light levels (links below in case someone know them) . Is there an affordable way to estimate them? Or at least to check whether there are above or below a reasonable threshold (say, the values of incandescent light bulbs)?
https://www.amazon.co.uk/gp/product/B084SWZ1R4/
https://www.amazon.co.uk/gp/product/B08C2TPTD3/
I have a VEML6070 that can measure UV for cheap if you have a Pi to pair it with.
> I’ve already have two LED light bulbs with no enough manufacturer data on the UV and blue light levels
for spectrum testing, there are some apps for android,
maybe ask contactcr what he uses
fwiw, re your second link,
3000k warm white is believed to have quite low blue levels,
it is a similar match for incandescent color temperature, but LEDs tend to make less red light than incan
I suggest you write the manufacturer for a link to their spec sheet, I would want to know the CRI specs
your first link says:
“No Blue Light”
sounds like you want to verify the spectrum
maybe also google the products for a review, some reviews have spectrum data
Haven’t tried it, but snap a pic of “stuff”, including white paper and some blue stuff, and in a photo-editor like IrfanView, kill the red/green channels.
In theory, something blue will look black with no blue light to illuminate it.
Or whitewall it and lookit the color histogram.
That would require the pigment to reflect pure blue rather than a composite that looks close enough to blue for us.
I would say the cheapest reliable way would be a prism like you would do in school, you may need to make it point-like with some cardboard, I don’t know. You probably need some glow in the dark material extending beyond the violet projection to detect UV, but most LEDs don’t make any significant amount of UV.
Or just google DIY spectrometer, you would probably get something more useful.
8bux: https://www.amazon.com/dp/B00B84DGDA/
I got a coupla these a few years ago. Work nice if the light is bright enough, else it’s hard to see.
FWIW, I’ve been doing research on what’s out there for legit Spectrometers. Here’s a google sheet for reference. The spectrum range is listed as well, and there are quite a few that go into UV range.
Wow. Your research (but unfortunately also the prices) .
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