Let me supply a little logic to my choice of number 1. If someone is a fairly new member, they probably want to find out about the 445 lasers because that is what they saw. So having the 445s have their own section means that it is easily accessible by the new members. Next I would think these members would branch out to the green and red lasers, and also bluray. Those all have their own section as well. By that time though, they will have heard enough to know about the more exotic wavelengths, and they can check out that area. If you combine the blues, however, any and all information anyone might want to find on the more rare wavelengths will be almost impossible to find. Both options 2 and 3 would create pretty bad organizational/clutter problems in the new boards because of 445's presence.
If you had Brad Pitt, Albert Einstein, and Galileo all in a room and you let in 500 people, 450 of those people or more will flock to Brad Pitt and any people trying to talk to Einstein or Galileo will be hard pressed to do so. If you put Brad Pitt in one room, however, and Einstein and Galileo in another, you will keep the fanatics satisfied with Pitt while the 50 or so interested in E and G will be able to have a very intelectual and stimulating discussion and won't be drowned out by screaming women.
Just my 2 cents, and sorry for the block of text.
Peace,
Isaac