🔌 Power Supply Guide
Three power supply models are used across the entire Forest of Light installation. Each model serves a different purpose based on voltage requirements, wattage capacity, and cable run distances. Understanding which PSU to use for each product is critical to safe and reliable operation.
Models at a Glance
| Model | Voltage | Default | Qty Provided | Best Use |
|---|---|---|---|---|
| HLG-320W | 21–27V (adjustable) | 24V | 18 PCS | Low-power products, long cable runs |
| XLG-320W | 12–24V (adjustable) | — | 72 PCS | High-power products, multiple units |
| XLG-200W | Fixed | — | 90 PCS | Trees, igloos, sign/letter lights |
An extra 20 units of 320W power supplies have been provided as backup spares.
Voltage Adjustment Rules (HLG-320W)
The HLG-320W is the only model with a user-adjustable voltage potentiometer. Follow these rules strictly:
- Normal use: Do not adjust. Leave at the factory default of 24V.
- Long cable runs: You may increase voltage up to approximately ~26V to compensate for voltage drop over distance.
- NEVER set to 27.7V: Running at maximum voltage will degrade and damage LEDs at the start of the light string.
- Always verify with a multimeter after making any adjustment.
Warning: Setting the HLG-320W to 27.7V will cause permanent LED damage. Always verify output voltage with a multimeter before connecting lights.
When to Use Each Model
HLG-320W
- Best for long distance, low power applications.
- Supports up to 30 sets of low-wattage products on a single PSU.
- Used for: decorative spheres (Item 1), arch decorations (Item 3), and similar low-draw products.
XLG-320W
- Best for high power applications and connecting multiple units to a single supply.
- Used for: balls on trees, mushrooms, balloons, and igloo lighting.
- Adjustable 12–24V range supports a wider variety of LED products.
XLG-200W
- Dedicated to tree items (9–11), igloos, and letter/sign lights.
- Fixed voltage — no adjustment needed or possible.
- One PSU per tree — do not share across multiple trees.
- Letter lights: Position the PSU in the middle of the sign run for even power distribution.
Wiring Rules
| Scenario | Power Feed |
|---|---|
| 20–30m rope light | Single end feed |
| 40–50m rope light | Both ends feed |
| Up to 3 string light strings | Single power lead |
| 6 string light strings | Both ends (beginning and end) |
Tip: When in doubt about cable length, measure the run and check voltage at the far end with a multimeter. If voltage drops more than 1–2V from the PSU output, consider feeding from both ends or increasing PSU voltage (HLG-320W only, max ~26V).