The picture at link [1] is correct, but it makes the LED look way, way better than it is. It does show some light smeared through the spectrum, unlike with the CFLs, but it's not actually even in intensity, and has some sharp peaks (which you can't see in a test like this). Many people find LED light annoying, even more so than CFLs, when it's the primary light source. Of course, that's totally subjective, and some people even like the effect.