Lukas T

Cofounder of EA Graz, Entrepreneur, Circling Facilitator, Co-Organizer of the annual Circling Festival in Germany

Comments

Why indoor lighting is hard to get right and how to fix it

Thank you, great post! I especially liked your insight on the color rendering index.

There are some reports that LED lighting can damage your eyes. From a quick glance at Wikipedia, the evidence does not seem very convincing, but I'm not an expert. What do you think about those claims? https://en.wikipedia.org/wiki/Biological_effects_of_high-energy_visible_light#On_eye_health

And if there is no particular danger from LEDs: Is there an inherent danger in looking at high-lumen lights (regardless what type of light it is)? At which point do we have so much brightness in one small spot that it becomes dangerous?

Two relevant links: https://www.reddit.com/r/science/comments/5m8sn7/leds_may_cause_retinal_toxicity_at_occupational/ https://www.reddit.com/r/photography/comments/d5ag44/how_many_lumens_is_safe_for_eyes_over_long/

March Coronavirus Open Thread

When to cancel events due to Coronavirus? Calculations by Linch Zhang [1], I've put them into a Guesstimate with some slight changes and adaptions for Austria [2]

[1] https://docs.google.com/document/d/1A0jcxj4n0BvNt_jMunHT5WSsAKFzuVJJyaaqcK9Z1HU/edit#

[2] https://www.getguesstimate.com/models/15367

March Coronavirus Open Thread

Dating during Coronavirus: What's the risk of going on a date with a random new person at the height of an outbreak? https://www.getguesstimate.com/models/15381

Under my assumptions, if 1 in 7700 people gets newly infected every day, it translates to an infection risk of 0.2% per encounter (range of 0.45% - 0.053%). Feedback welcome.

Is there any value in self-quarantine (from Coronavirus), if you live with other people who aren't taking similar precautions?

This question (“will I get infected if people in my household are sick?”) was asked in the recent Reddit AMA with experts. Keep in mind I didn't verify the original sources.

“It is possible to stay uninfected! Yesterday in a press briefing, Dr. Nancy Messonnier at the CDC said that the secondary attack rate among family members of confirmed COVID-19 cases in the U.S. is 10.5% so far. So that means that about 1 in 10 family members who have been exposed by a relative have gotten sick.”

Here’s the posting and some more comments about this issue: https://www.reddit.com/r/Coronavirus/comments/fdf5fq/we_are_a_team_of_medical_experts_following/

Coronavirus: Justified Practical Advice Thread

What is your source for this? The CDC recommends hand sanitizer in cases where washing is not easily possible. https://www.cdc.gov/coronavirus/2019-ncov/about/prevention-treatment.html

Studies confirm the efficacy of hand sanitizer against enveloped viruses [1][2]. Although there is some evidence that handwashing is preferable against viruses [3].

[1] https://academic.oup.com/jid/article/215/6/902/2965582

[2] https://apps.who.int/iris/bitstream/handle/10665/44102/9789241597906_eng.pdf;jsessionid=D50A762FABCFB1569406859669F8FAD4?sequence=1

[3] https://msphere.asm.org/content/4/5/e00474-19