## How many low voltage lights can I put on a transformer?

A typical halogen lamp is going to need 20 watts of power. A 150 watt transformer can only support up to 150 watts of lamps. This means the most you could add onto this transformer would be 140 watts, or 7 halogen lamps.

### How do I know what size LED transformer I need?

Take the length of your LED strip in feet and multiply it by the watts consumed per foot, then multiply by 1.2. This will give you the minimum sized power supply you’ll need to run your strips.

**How many watts do I need for low voltage transformer?**

The rule here is that the maximum wattage load of your transformer must be equal to or larger than the total wattage of all the light fixtures you are connecting to it. Let’s say you have one light fixture with one 60-watt light bulb for the transformer mentioned above. That’s fine.

**How do you calculate landscape lighting transformer?**

So, if you want to connect ten landscape spotlights to a small transformer, and the lights utilize 2W / 4VA / 20 watts halogen equivalent light output power each, you would want a 100-watt transformer. (Example of calculations: 10 lights X 4 VA = 40 voltage amps).

## How many watt transformer do I need?

In order to do this, simply look for the “W” on your device’s label. This will help you determine which transformer you need. If the device is 300 watts, then you will need to buy a transformer that is also 300 watts.

### What happens if you exceed the wattage on a low voltage transformer?

Do not over-load transformers beyond their rated wattage or amperage capacities – this can cause over-heating and become a fire hazard. The NEC (National Electric Code) requires that appliances which operate more than three (3) hours per day be derated to 80% of their capacity, so 300W x . 8 = 240W max.

**How do I choose a LED transformer?**

Calculate power supply for LED strips

- A 12V LED stripe with a length of five feet and 14.4 W/ft shall be operated:
- 14.4 watts · 5 (feet) = 72 watts.
- Add 20% power reserve:
- 72 watts + (0.2 · 72) = 86.4 watts.
- → A 90 watts transformer would be a good choice here.

**Do I need a special transformer for LED lights?**

All mains powered LED bulbs require a transformer. Depending on the bulb type, the transformer/driver may be built in to the bulb casing or may be located externally. The purpose of the transformer is to reduce mains voltage (240V) to the desired level relative to the bulb being powered (e.g. 12V or 24V).

## How big of transformer do I need?

To determine the required transformer VA, multiply the secondary voltage by the required amperes: For example, VA=Volts x Amperes or 28V x 1.2 amperes = 33.6 VA. To determine the maximum transformer current, divide the transformer VA by transformer secondary voltage.