A:Answer Hello Valued Customer, thank you for the question. You can simply press and release the switch once for it to go on at full brightness. If you have any further questions or concerns, please feel free to give us a call between the hours of 7 AM – 8 PM Central Standard Time, Monday thru Friday at 1-800-654-8483, press option 4, and provide our Consumer Care Team with your personal ticket number 523107, so that we can resolve your issue promptly.