Hi all, recently retired from electronics repair. I know almost nothing about lasers except what I have read over the last few days. All the numbers are very confusing, is any chart available with description of what stuff means. Anyway, I bought a cheep blue laser diode it is <500mw m140 5.6 mm TO-18. What is m140 mean, but anyway I would like to order something to put the diode into with maybe a g2 to g8 lens or would that work for blue, I don't know. What would be good stuff to put this diode into. Wanted to have something to mess with while I learn. I have read about safety and ordered us glasses for 20 bucks. Maybe a link to buy a housing where I would not get ripped. Thanks for your time. This site Im sure has all the answers I need, and i will be spending many many weeks learning.