ATX LED strip lights require a constant current driver for highest lm/watt rating, these are wired in series. Class 2 limits and off the shelf driver limits, result in a maximum voltage of 45 volts. This translates into 15 ft of the 3 volt model, or 7.5 ft of the 9 volt model.
They offer 2 watt/ft, 4 watt/ft and 8 watt/ft operation.
The 3 Volt models are available in 7 inch, 9 inch and 12 inch lengths that allow total fixture lengths from 12 inches and up at 2 inch cut lengths. The maximum length is 15 ft when using drivers with 48 volt maximum outputs. Operate a 660 mA for 2 watts/ft o 1440 mA for 4 watts/ft.
The 9 Volt models are available in 18 inch lengths that allow total fixture lengths from 19 to 91 inches. The maximum length is 7.5 ft when using drivers with 48 volt maximum outputs. Operate a 660 mA for 4 watts/ft o 1440 mA for 8 watts/ft.
All are perfectly dimmable to 0 mA.