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Everything about LEDs: Basics of High Power LED Lighting
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HUBBELL Cord Remote Double Head LED Waterproof Outdoor Emergency Exit Lighting, 2 Total Watts, 3 VDC Voltage Rating, for Residential Entrance or Exterior Wall Mounted, White - Commercial Emergency Light Fixtures - Amazon.com
datasheet - What's the difference between typical and maximum forward voltage for an LED? - Electrical Engineering Stack Exchange