Armacost Lighting840240 for LED Lighting, with Removable AC Cord, 24 Watt, White

My under cabinet lights stopped working. Changed the dimmer switches, but it finally was the transformer. All good now.

Easy installation. I wired directly to a dimmer switch and it works perfectly.

Quality made, nice and compact, works as advertised

One of the few LED drivers that can be dimmed in compliance with the NEC for electrical inspection. The cord that came with it can be unscrewed and the driver can be hardwired with 14-2 romex. The connections are circuit board terminal blocks on each end, so they required a jeweler screwdriver. Be sure to hold the blocks when tightening the screws, so the block doesn't torque off the circuit board.The unit does soft start and ramp to full in 1 sec. Other than that, there isn't a 3 sec delay to warm up like cheap switching power supplies have before they instantly pop on at full brightness. That's nice.I had no problem using a z-wave smart dimmer. I used the a Linear aka Nortek aka GoControl model WD500Z5 zwave dimmer and it successfully burned in so far for 1 day. It does get very warm, even pushing only 10 watts. Like a hot McDs coffee cup hot. Not too hot to start papers on fire, but too warm to be comfortable holding. Plan for that when mounting.Also, If you wired several LED homeruns instead of daisy chaining the runs, be sure to plan on wirenuts or a terminal block to connect to the driver- it only has internal room for 1 #12 pair of wires. You have no internal room for other connections.I powered 10 watts of LED under cabinet LED tape. The cables in the pic are 14-2 romex and 16-2 cl2 riser cable. No issues with those gauges.

The Armacost Lighting 840600 is a high quality, dimmable power supply for 12V LED fixtures or systems.COMPATIBILITY: This power supply should be compatible with a wide range of 120V dimmers. The installation instructions state the following:"Armacost Dimming LED Drivers are compatible with both forward phase (leading edge, triac, incandescent) and reverse phase (electronic low-voltage, ELV, and trailing edge) AC dimmers ... They are also compatible with low-voltage PWM dimmers and RGB color controllers."Although virtually all dimmers will work with Armacost Dimmable LED Drivers, Armacost Lighting recommends dimmers that can be programmed or have an adjustment dial to set the low end dimming range."BUILT IN CONNECTORS: The built in connectors work well and quickly. They need to have some of the outer insulation to clamp onto, to keep the stress of any pull on the wire from going to the terminal connection itself. So don't strip too much of the inner or outer insulation.LOW MINIMUM POWER LOAD: The minimum power load is just 5 watts.VOLTAGE: Output is 12V DC.DIMENSIONS: It's somewhat large, at 7-1/16 inches long by 2-3/8 inches wide by 1-3/8 inches high.ENCLOSURES: If you want an enclosure, Armacost makes variations with enclosures for conduit connections.The only real negative is the cost, though of course having a high-performing, high quality power supply makes it a reasonable value. Lower-watt drivers are less expensive than this one.The manufacturer's website has lots more info, including specs and installation instruction.TWO WARNINGS: First, be sure to get a power supply rated with enough watts to cover your needs.Second, be careful to get a power supply with the right input voltage. Armacost makes a line of 12V dimmers and matching power supplies. This product is the universal power supply, to be used with a range of dimmers and 120V.

Very easy to install. I hard wired the power pack and also installed a dimmer switch. Works perfectly with no humming. Great product.

Put in a dimmer switch and get the 120 leds per meter. You can crank it up to give all the light you will ever need and yet dim it down to simply add ambience to your kitchen. I installed them in the channel with the diffusers and absolutely love them.

Wow an LED driver / power supply that actually dims the LEDs!!!I thought there was something wrong with my LEDs or dimmer as I tried two different PLUSPOE dimmers that did not actually dim anything and also buzzed.This driver actually works, and works well. I am using the 12v/24watt one to drive 8x half moon 12v LED stair lights. I am also using a Leviton 6674 dimmer in the wall. There is no switching noise from this driver, the construction is solid and the dimming is smooth without flicker. Completely worth the higher price than non certified drivers.The only thing that was odd is that it did not come with a power cord. The lack of a power cord was not a big deal as I had one laying around, but I could see it bothering other people. I have a light switch controlling half of a receptacle in low voltage box, so I did need one.