Princeton Tec AMP3 LED Flashlight. The Amp 3.0 provides 40 lumens of powerful light through four ultrabright LEDs. A powerful, yet clean flood is unlike any other handheld in our line. From campsites, to backcountry treks, or simply walking the dog, the Amp 3.0 has the power and versatility to handle it all. A great light for kayaking, running, camping or work.