FAQ: How Do I Choose a Power Supply? Our Power Supply Guide

We regularly get questions regarding power supplies. We understand they tend to be the most complex part of lighting, which is why we continue to simplify this option. We recommend discussing power supplies with your electrician or our team prior to purchasing if you’re unsure of compatibility with your space and fixture.

 

What is a power supply?

Understanding what type of power supply you need starts with an understanding of why you need one in the first place. A power supply is connected between the main line of power and your light fixture. It converts line voltage to 24VDC low voltage so your LED fixture is able to handle the proper amount of output voltage. All LED light fixtures need a power supply because if you connected an LED fixture straight to the main power source, your LED fixture will become overloaded and blow out.

1. Where will your power supply be located?

Power supplies can either be local or remotely located. Essentially, the difference is that local power supplies at located directly above the fixture, within a canopy on the ceiling. Remote power supplies are located away from the fixture and in an accessible location, like a closet or cabinet area. Learn more about the differences here.

 

2. What kind of dimming does your space require?

This is a variable that is determined by your electrician. Juniper offers either 2-Wire/TRIAC/Forward Phase, 0-10V, or 3-Wire/Ecosystem dimming options.

Generally, 2-Wire/TRIAC/Forward Phase dimming is hooked up to a wall dimmer or switch. This is standard in residential or basic electric situations when the fixture is powered by a light switch. This is our most common option for single-fixture setups or residential spaces.

0-10V refers to the dimming range in volts. At 10V, the lights controlled by the dimmer are at 100% brightness. At 1V, the lights are at 10% measured brightness. At 0V, it either turns the lights off or has the lights dimmed to the lowest possible level and a switch is required to turn the lights completely off. 0-10V dimming is compatible with many wireless dimming systems, Lutron, and Leviton systems. This can be used to connect numerous fixtures together ideal for commercial or hospitality settings.

3-Wire is a Lutron-specific capability used for Lutron Ecosystem setups and is compatible with the Caseta wireless dimming system. Sometimes, our clients are determined to use name brands familiar to them for power supplies. Since Lutron is a reputable brand and well-known through the industry, clients have peace of mind when purchasing a Lutron product. Although all of our power supplies are reputable and well-tested, we offer this option for clients who are setting up a new 3-Wire system or adding to an existing one.

3. What is your input voltage?

Juniper offers universal input power supplies, so all of our power supplies should work with any location’s voltage, across the globe. If you’re curious, depending on your location, your area’s voltage is assigned to you. Usually, it’s either 120V in the America’s, or 277V for European areas. Check this voltage map to see your location’s voltage.

 

4. What is your fixture’s total wattage?

Juniper calculates this for you and we only provide power supplies compatible with your fixture’s wattage. However, this is helpful to understand when connecting multiple fixtures to the same power supply. If you plan to do this, we recommend telling our team so we can guide you in the right direction.

Once you calculate the total wattage you’d like to connect to a power supply, it’s important to look at the power supplies’ output wattage. Your fixture can not exceed this value. Juniper offers power supplies up to 96W, and when a fixture exceeds one power supply, it’s easy to install the fixture on two power supplies together. Juniper uses a 10% buffer for power supply output wattage, so that the fixture’s wattage doesn’t get too close to overloading the power supply. For example, we only connect fixtures with a wattage of 54W or less to a 60W power supply.

As always, we recommend checking with your licensed electrician or our sales team prior to choosing power supplies. For any and all questions regarding power requirements and lighting inquiries, please don’t hesitate to contact us!

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