3 ms·
What intensity of light, for how long compared to sunlight? Every time I hear these blue-light crusaders I am reminded of that “iPads are bad for reading” so-c
by manicdee 7y ago
What intensity of light, for how long compared to sunlight?
Every time I hear these blue-light crusaders I am reminded of that “iPads are bad for reading” so-called experiment where the iPads were fixed to the desktop set at maximum brightness with a custom font chosen by the experiment lead. Basically attempting to make life as uncomfortable for the subjects as possible, then blaming all the negative effects on blue light emitted by the iPad.
So short version: is this study meaningful in an way or does it shorten lifespan by using extremely bright blue light for many hours longer than a natural day/night cycle?
edit: they maintained similar photon flux density so the blue light would have been extremely bright to compensate for being a single wavelength.
Edit2: the actually useful words in that linked paper are about two paragraphs, the rest is baseless speculation. An effect was observed, with no mechanism described, therefore extrapolation beyond the experimental conditions is entirely in the realm of fan fiction and soap opera (ie: emotive drama).
- ip26 7y agoThe study is worth reading. The light exposure was for 12 hours/day, they showed steadily increasing mortality with increasing photon flux density of blue, and they showed that white light exposure with blue filtered out (at the same intensities) did not have the same effect.
- manicdee 7y agoThey also did not test increasing photon flux density of white/filtered light. They only bothered controlling for PFD after introducing filtered light. Sounds like experimental protocol was invented … on the fly.
- ghostly_s 7y agoAlso, white light with the blue filtered out is not an appropriate control condition. What's to say the blue light flies didn't just deteriorate normally and the artificially filtered white light had a positive health effect for the control group?