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One could use a bicycle lamp easily enough and I suspect it would be smaller and lighter than the DIY setup shown. http://www.lumicycle.com/mountain-bike-light

by buro9 10y ago

One could use a bicycle lamp easily enough and I suspect it would be smaller and lighter than the DIY setup shown. http://www.lumicycle.com/mountain-bike-lights/summit-range/summit-2016.html http://www.lumicycle.com/mountain-bike-lights/summit-range/s... That lamp is 1,100 lumens on standard high power, lasts over 4 and a half hours at that brightness. And if needed, there is a boost mode that gets you 1,650 lumens but only for a couple of hours. This is for the smallest battery, a 2.6ah that weighs 220gms. And if you're wondering, yes my bicycle has insane lights. 2 of those and then a 605 lumen dynamolamp giving 3,905 lumens on a bicycle. Yes,I chose tight beam and aim at the ground about 10m ahead, unless I leave the city when I put one wide beam lamp on and raise it a little.

peter_132 10y ago
1k lumen need about 10W electricity if produced by white LEDs. This drone has about 50-100k lumen
- buro9 10y ago
  My mistake, I autocorrected W to Lumen when I read the headline.
- FoeNyx 10y ago
  On a side note, it might not be a good idea to directly glare at powerful LEDs. French Agency for Food, Environmental and Occupational Health & Safety noted [1] some points that might not be photo-biologicaly safe, the main points being: > spectral imbalance (significant proportion of blue light in white LEDs); > high levels of radiance (high brightness density per surface unit emitted by these very small sources) In the french version of their report, they refer to luminance [2] rather than radiance. The spectral imbalance photochemical risk seems linked with cumulative dose of blue light, so there is also a risk with low but long exposure light LED screens. It also perturbs circadian cycle (flux or redshift might help in that case). See also a previous HN discussion about a warning from the American Medical Association about the spectral imbalance in LED streetlights [3]. -- [1] https://www.anses.fr/en/content/led-%E2%80%93-light-emitting-diodes https://www.anses.fr/en/content/led-%E2%80%93-light-emitting... [2] https://en.wikipedia.org/wiki/Luminance#Health_effects https://en.wikipedia.org/wiki/Luminance#Health_effects [3] https://news.ycombinator.com/item?id=11992946 https://news.ycombinator.com/item?id=11992946

by buro9 10y ago

peter_132 10y ago

1k lumen need about 10W electricity if produced by white LEDs. This drone has about 50-100k lumen

buro9 10y ago
My mistake, I autocorrected W to Lumen when I read the headline.
FoeNyx 10y ago
On a side note, it might not be a good idea to directly glare at powerful LEDs. French Agency for Food, Environmental and Occupational Health & Safety noted [1] some points that might not be photo-biologicaly safe, the main points being: > spectral imbalance (significant proportion of blue light in white LEDs); > high levels of radiance (high brightness density per surface unit emitted by these very small sources) In the french version of their report, they refer to luminance [2] rather than radiance. The spectral imbalance photochemical risk seems linked with cumulative dose of blue light, so there is also a risk with low but long exposure light LED screens. It also perturbs circadian cycle (flux or redshift might help in that case). See also a previous HN discussion about a warning from the American Medical Association about the spectral imbalance in LED streetlights [3]. -- [1] https://www.anses.fr/en/content/led-%E2%80%93-light-emitting-diodes https://www.anses.fr/en/content/led-%E2%80%93-light-emitting... [2] https://en.wikipedia.org/wiki/Luminance#Health_effects https://en.wikipedia.org/wiki/Luminance#Health_effects [3] https://news.ycombinator.com/item?id=11992946 https://news.ycombinator.com/item?id=11992946