Which of the following would NOT be used in a low voltage landscape system?

In a low voltage landscape lighting system, the primary considerations often include safety, ease of installation, and energy efficiency. Low voltage systems typically utilize a transformer to reduce standard line voltage (120V) down to 12V or 24V, making them suitable for outdoor settings where electrical shocks can be a concern. They also use smaller, lightweight fixtures that are easier to install and adjust.

HID (High-Intensity Discharge) lighting, on the other hand, typically operates at high voltage and is known for its intense illumination and efficiency in commercial applications. HID fixtures tend to be bulkier and require specific ballast systems. Since they operate at higher voltages, they do not fit within the low voltage criteria and would not be suitable for installation in a low voltage landscape system.

The other options, such as adjustable accent lights, deck lights, and tree-mounted downlights, are designed specifically for low voltage operation. They provide flexibility in design and placement in landscape applications, aligning with the requirements of low voltage systems.