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Focus an LED Answered

I was wondering if anyone knew how to focus more than one LED (infra red) into one tightish (about 1m at 100ms) beam. This would actually be for a laser tag gun that i would like to make an instructable about. The game is based on these high powered infrared leds that are focused by a 2cm-5cm diameter double convex lens assembly. Snipers obviously need further distance and have a tight beam while others have a much wider beam. The focus can be adjusted by moving the led back or forwards. Having more than one LED may lead to dramatic leaps in range (so it is theorised). I have been told to use cube beam splitter but i don't even know what they are. Thanks community any help is seriously much appreciated Thankyou Thankyou Thankyou Thankyou

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