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What color diode and what wattage would produce a "beam" that is visible?

Well, i was going to try and make something like Kipkay's Laser Phaser but i wanted it in a lightsaber. So, i googled a bit and found what kind i am making hxxp://bigyellowbox.tripod.com/plans08/main.htm and the original design holds 2 AA batteries but i thing a 9V battery would fit to power the...

Ok, so I am starting to make my own laser lightsaber with a blue ray laser, but i have some questions about powering it 1. if i buy the blue ray diode and the kit for powering the diode form daedal would it work with 2, 1.5 volt AA batteries and how would i regulate it. 2. What type of eye...