LED NEON FLEXIBLE TUBE POWER SUPPLIES - 24 VOLT. Note Power Supplies are required along with the Power cord adaptors for the 24 volt. The Power Cord Adaptors are available in 1.6 Amp - Maximum Run 20 feet, 4.0 Amp - Maximum Run 40 feet. The 35 watt power supply is rated for maximum run of 15 feet, and the 100 watt power supply is rated for maximum run of 40 feet.