constant-current LED driver or constant-current driver is used to regulate the amount of current that is supplied to an LED or LED array to maximize LED lifetime. If current is not regulated, LED brightness can fluctuate and life span can be shortened. The constant-current driver is used for LEDs or light fixtures that require a stable output current and operate within a range of voltages. Most finished LED products already have a constant-current driver or resistors to regulate current. If you’re building an LED fixture or replacing a constant-current driver, it’s important to verify that the output current and voltage of the driver is compatible with the LEDs’ current and voltage. If your LED product already has a constant-current driver or uses resistors in the LED array, you might need a constant-voltage power supply.

If your LEDs are dimmable and you want to change their brightness, choose a Magnitude Dimmable Power Supplies. These dimmable power supplies work by varying the power on the AC input side of the power supply by means of a TRIAC dimmer. This change in power on the AC input side will vary the voltage on the DC output side and control the intensity of the LEDs. TRIAC dimmers are common hardware store and household dimmers, which include brand names such as Lutron and Leviton.

Pulse-Width Modulation Dimming: Pulse-width modulation (PWM) dimming can be used to control dimmable power supplies such as Mean Well LPF Series. This type of dimming control adjusts the output current based on the duty cycle. As the duty cycle increases, current will increase and the LEDs will be brighter. Conversely, if the duty cycle decreases, the current will decrease and the LEDs will be dimmer. Pulse-width modulation for these drivers is based on a 10-volt signal level with a frequency between 100Hz-3KHz. The MLD-5A are compatible for this application.

Resistive Dimming: Resistive dimming can be used to control dimmable power supplies such as 12-Volt Mean Well HLG-40-240 Series or 12-Volt Mean Well HLG-600 Series or here.

The efficiency of a power supply or driver indicates the percentage of power that goes toward making your LED product function. An efficiency of 80 percent or higher is recommended for operating LEDs. 

When choosing a driver or power supply, the size of an LED product’s housing or area of installation is important. If you wish to put a constant-current LED driver inside of a product, the driver must be small enough to fit in the product’s housing. Similarly, if the driver or power supply is used outside of the product’s housing, it should fit the area of installation. Drivers and power supplies are available in a variety of sizes to suit your needs.

A Class 2 driver or power supply is in accordance with limited power levels defined by the National Electric Code (NEC) and fulfills the requirements of Standard UL 1310. Output is limited to 60 volts DC and 100 watts. Because power sources with this rating have limited output, it might not be possible to power as many LEDs or lights as those that don’t have a Class 2 rating. However, these power supplies and drivers provide protection from fire and electric shock.

A Class II rating refers to a double insulation layer between AC input and DC output wires. These drivers and power supplies do not require a ground connection.

It’s back to school time here in Arlington! Finally we get that cooler weather and lower humidity we’ve been begging for all season long. But with winter on our heels, there’s about to be a greater need for electricity use in the home. Is your home prepared to meet your increased electrical needs safely?

At Kolb Electric, we’re always about solutions. Whether you need wiring, electric outlet replacement, or even a heavy-up, we’re there to help! Let’s take a look at some of the most-used appliances and electrical sources in the home for winter, and how you can be sure you’ve got safe access to power.

With summer fun over, we have to find a lot of new ways to enjoy our homes, and many of these require access to electricity. Mostly this is totally fine, but there are some cases where you might run into some safety snafoos and snags (particularly in older homes).

At Kolb Electric, we eat, sleep, and breathe electricity. Well, not literally, but you catch the meaning. No one knows the industry like our certified electricians, and patrons have been depending on Kolb for superior service for decades! Contact us today to learn more about electrical services in Arlington, or to set an appointment for your back-to-school electrical service needs!

There’s a lot more to the cost of a light bulb than the price tag sticker. There’s the impact on your electrical bill, the tally of replacement bulbs you’ll need to buy, and the time you have to factor in for maintenance. Sure, the light bulb in your table lamp may take just a few minutes to replace, but what about your recessed cans that are two stories away from easy access?

We published an infographic on Lighting Facts, a program of the U.S. Department of Energy, created the one below, showing the five-year-cost of 100 watt equivalent light bulbs. As you can see, the low purchase cost of an incandescent light bulb doesn’t necessarily pay off in the end: