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Im planning on building a super long green laser pen (roughly 2 feet long) and my question is how strong of a laser could i fit into a housing of that size? And would there be any issues or problems due to a housing like this?

Hello so i recently got into the hobby of buying and building lasers and im relatively new to electronics but i know the basics, my current project involves moddifing a cheap 5mw keychain laser pointed into atleast a 800mw Class 4 red laser, now ive done simple dvd burner diode mods but i never...