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How can I tell the difference?

I have two diodes I've been eyeballing. https://sites.google.com/site/dtrlpf/home/diodes/9mm-445nm https://sites.google.com/site/dtrlpf/home/diodes/445-m140-didoes The top one is capable of 3W and the bottom one is capable of 2W. What lens should I get? I need the smallest possible dot for...

Remember the "I'm broke" part of this? Yep, still in college. But I do understand more about the wavelengths now. So thank you. And @joeybab3, What would you recommend? The 16X 1W 405nM sound good? With a 3-element lens? And still do I need a driver if I use an adjustable power supply?

Let me clarify on the "regulated" power supply. It is adjustable (both V and A) so perhaps regulated isn't the correct word. So could I use it and start it off slowly and then bring it up to specs? Also would 2W be enough for the wood burning? And where would I post my introduction? Thanks, Aaron

The only issue with those is the price. I'm a college kid and don't have much spending money. I realized that they were invisible-mostly invisible. Would I need a driver if I use a regulated power supply? I don't plan on making it a hand-held. Do you have any cheaper suggestions as well?

Hi guys, I'm new here. I was wondering if I could get some help with a new build I want to do. I need a 3W laser or something of that caliber for some wood burning. It has been a project idea for a long time of mine and I had the inspiration from this instructables: 3W 4'x4' Arduino Laser...