Could someone tell me the frequency that this dimmer's pwm module operates at? my eyes are susceptible to led flicker. 60hz would be way too slow.

I just measured mine with an oscilloscope. It switches at 1200 Hz, which is lower frequency than I would’ve expected for a PWM switch. The minimum on period is about 5%, and the maximum is about 92%. Mine has a voltage drop (PWM +Mosfet RDSon) of approximately 1 V with a 14 amp load. it is probably in excess of 1.5 V at it’s rated load (30A). I use a Meanwell 15 volt 200 watt power supply set to 13.2 volts to get full brightness from my 12 V / 14 amp LED string. If you go this route, the voltage adjustment is a small potentiometer next to the terminal block on the power supply.

Will this work on a 18 w 12 v led light?

Yes and these dimmers work very well. I have 2 of them and they control 50 ft. of lights each. They are very "smooth" in dimming. Not all jumpy like others..

I wire from the battery to the "in" side and to the lights (strip led) on the "outside" of the controller. Works once then it won't dim?

I would send it back. Must be defective. Mine work fine

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SUPERNIGHT LED Light Strip Dimmer, DC12V-24V 30A PWM Dimming Controller for Dimmer Knob Adjust Brightness ON/Off Switch with Aluminum Housing

SUPERNIGHT LED Light Strip Dimmer, DC12V-24V 30A PWM Dimming Controller for Dimmer Knob Adjust Brightness ON/Off Switch with Aluminum Housing

Product ID: 457286808

Details

Brand
SUPERNIGHT
Connector type
Thread
Contact type
Normally Open
Current rating
30 Amps
Item dimensions L x W x H
9 x 6.5 x 4
Material
Aluminium

⚡Supports up to 30A current load

🔆0%-100% PWM dimming precision

🛡️Durable aluminum housing with IP44 rating

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Description

💡 Light up your space, your way — precision dimming that means business.

BUILT TO LAST - Premium aluminum casing ensures superior heat dissipation and corrosion resistance for long-term reliability.
LED PROTECTION TECH - PWM dimming prevents rush current, extending your LED strips’ lifespan and performance.
ROBUST POWER HANDLING - Handles up to 30 amps at 12-24V DC, ideal for powerful LED strip setups without compromise.
EFFORTLESS INSTALLATION - Screw-in terminals and pre-drilled mounts make setup quick and hassle-free—get your lighting right now.
SEAMLESS BRIGHTNESS CONTROL - Rotary knob lets you dial in perfect lighting from subtle ambiance to full brilliance.

The SUPERNIGHT LED Light Strip Dimmer is a high-performance PWM controller designed for 12-24V LED strips, supporting up to 30A current. Featuring a smooth rotary knob for 0%-100% brightness adjustment, it combines durable aluminum housing with IP44 protection for reliable, long-lasting use. Easy to install with screw terminals and engineered to protect your LEDs from electrical surges, it’s the smart choice for professionals and enthusiasts seeking customizable, robust lighting control.

Specifications

ASIN	B07HN1BJWK
Actuator Type	Rotary
Best Sellers Rank	48,516 in Lighting ( See Top 100 in Lighting ) 2,150 in LED Strips
Brand	SUPERNIGHT
Circuit Type	1-way
Colour	Black
Compatible Devices	DC 12V-24V LED light strips (5050, 3528, 5630)
Connectivity Protocol	Wi-Fi
Connector Type	Thread Terminals
Contact Material	Aluminium
Contact Type	Normally Open
Control Method	Push Button
Control Type	Brightness Control
Controller Type	Mechanical knob
Country Of Origin	China
Current Rating	30 Amps
Customer Reviews	4.3 4.3 out of 5 stars (605)
International Protection Rating	IP44
Item Dimensions	9 x 6.5 x 4 centimetres
Item Weight	0.01 Ounces
Manufacturer	SUPERNIGHT
Manufacturer Part Number	BKC1265-GM
Material	Aluminium
Model Number	7539579860
Mounting Type	Surface Mount
Number of Items	1
Number of Positions	1
Operating Voltage	24 Volts
Operation Mode	ON-OFF
Specification Met	Ip44
Switch Type	Dimmer Button
Terminal	Screw
Unit Count	1.0 count
Upper Temperature Rating	80 Degrees Celsius
Wattage	720 watts

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