Incandescent bulbs have a blackbody spectrum, usually somewhat redder than the sun's (which is also close to blackbody radiation, modulo a few absorption lines). White LEDs have a much spikier spectrum, usually with two to maybe a half-dozen peaks at different wavelengths, which come from the band gaps of their component diodes (a "single" white LED usually includes two to four) or from the fluorescent qualities of phosphor coatings on them. High-quality LED bulbs use a variety of methods to tune the locations of these peaks and their relative intensities such that they're visually close to sun or incandescent light; lower-quality ones tend to have them in weird places dictated by availability or ease of manufacture, which gives their light odd visual qualities and leads to poor color rendering. There are also tradeoffs involving the number of emitting diodes per unit. Information theory considerations mean that colors are never going to have quite the same fidelity under LED lights that they would under incandescent, but some can get damn close.
The same's true in varying degrees for most other non-incandescent lights. The most extreme example in common use is probably low-pressure sodium lamps (those intense yellow-orange streetlights), which emit almost exclusively at two very close wavelengths, 589.0 and 589.6 nm.
The most extreme example in common use is probably low-pressure sodium lamps (those intense yellow-orange streetlights), which emit almost exclusively at two very close wavelengths, 589.0 and 589.6 nm.
Yep -- if you take photographs under these lights (e.g. night street scenes), you essentially get tinted monochrome photographs. Under an almost-single-wavelength source of light there are no colors, only illumination intensities.
[Originally posted to my personal blog, reposted here with edits.]
Introduction
Something Impossible
The Well-Functioning Gear
Recursive Heroic Responsibility
Heroic responsibility for average humans under average conditions
I can predict at least one thing that people will say in the comments, because I've heard it hundreds of times–that Swimmer963 is a clear example of someone who should leave nursing, take the meta-level responsibility, and do something higher impact for the usual. Because she's smart. Because she's rational. Whatever.
Fine. This post isn't about me. Whether I like it or not, the concept of heroic responsibility is now a part of my value system, and I probably am going to leave nursing.
But what about the other nurses on my unit, the ones who are competent and motivated and curious and really care? Would familiarity with the concept of heroic responsibility help or hinder them in their work? Honestly, I predict that they would feel alienated, that they would assume I held a low opinion of them (which I don't, and I really don't want them to think that I do), and that they would flinch away and go back to the things that they were doing anyway, the role where they were comfortable–or that, if they did accept it, it would cause them to burn out. So as a consequentialist, I'm not going to tell them.
And yeah, that bothers me. Because I'm not a special snowflake. Because I want to live in a world where rationality helps everyone. Because I feel like the reason they would react that was isn't because of anything about them as people, or because heroic responsibility is a bad thing, but because I'm not able to communicate to them what I mean. Maybe stupid reasons. Still bothers me.