Here is a closeup of the ultrabright green LED.
You dont need to mounted it so much outside as the beam width of the light is quite wide and only project from near the end of the LED, it is done here for visual effect.
Mounted the LED further inside may provide more protection from physical knocks. A green ultrabright is chosen because the human eye has better response to green light and the LED is more efficient that a ultrabright white LED ( the LED itself emits ultraviolet light which is converted by a phosphor to white light )
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