From reading this forum five years back there was a lot of posts on how direct green diodes were developed for use in laser video projectors.
I have google and almost every top end laser projector on the market still uses blue diodes along with color changing phosphors to get red and green...
There are two rapid transition zones in the spectrum. One is from about 570-610nm, the other is about 475-515nm. 577nm would be nice if they make it at a low powered output.
561nm from what I see on the internet looks green with a hint of yellow to me. Yellow starts around 570nm, 589 is gold and 594 is orange. They'd need a 575-580nm for a true yellow.
Clouds will scatter the beam so the power will be reduce quite a bit, unless it is a strong laser and a very thin cloud. Red will have a lot more cloud penetration than blue with the same power.
Scattering of Light: by small particles and molecules in the atmosphere
Accessories such as a stand, clamps, tweezers, and desoldering tools, are the real wallet drain. The are essential though.
Also don't get the thick stranded solder, or the lead free solder both suck.
Also I find it easier to use a curved soldering tip rather than a straight one. It makes...