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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💡 Dim your world, brighten your vibe — control at your fingertips!

BUILT TO LAST - Robust aluminum casing ensures superior heat dissipation and corrosion resistance.
WIDE COMPATIBILITY - Seamlessly powers single-color 5050, 3528, and 5630 LED strips up to 30A.
HASSLE FREE INSTALLATION - Screw-in terminals and pre-drilled holes make setup quick and secure.
LED PROTECTION GUARANTEED - PWM digital dimming prevents rush current, extending your LED strip’s lifespan.
PRECISION BRIGHTNESS CONTROL - Effortlessly dial your perfect ambiance with smooth 0%-100% PWM dimming.

The SUPERNIGHT LED Light Strip Dimmer offers seamless 0%-100% PWM dimming for DC 12V-24V LED strips up to 30A. Its sturdy aluminum housing ensures excellent heat dissipation and durability, while digital PWM technology protects your LEDs from rush current. Designed for easy installation with screw terminals and mounting holes, it’s the perfect upgrade for customizable, long-lasting lighting control.