Minimum and Maximum Dimmer Loads for LED Fixtures

Dimmer loads for LED fixtures at minimum and maximum levels

Have you ever experienced this?

You've done your homework and made sure the dimmer you just bought works with your LED fixtures. When it's time to evaluate the performance, what you see is not what you anticipated. This is due to the fact that compatibility is but a piece of the fading jigsaw. There are a number of electrical specifications for the dimmer you have that must be met in order to assure appropriate operation. There are two of these specifications: minimum and maximum loads.

Lowest Loads

Dimmers have minimum load requirements because they will behave erratically if the LED load isn't pulling enough current to keep the dimmer's switching elements closed. Flickering, a narrower dimming range, flashing while the light is off, or even complete inoperation are examples of this behavior.

Because incandescent fixtures often utilize more power than LED fixtures, dimmers made for incandescent loads typically have a greater minimum load requirement. This indicates that in order to fulfill the minimum load requirement for these dimmers, several LED fixtures will likely be needed. The precise number of LED fixtures required for each incandescent dimmer must be determined through testing. Dimmers made for LED loads typically just need one or two fixtures and have a reduced minimum load demand. Instead of Watts (W) or Volt Amps (VA), the LED minimum load rating for LED load dimmers is typically specified in lamp count.

Optimal Loads

In order to prevent the load from going over the dimmer's design parameters, dimmers also have maximum load requirements. Overstepping these boundaries may cause breaker trips, flickering due to noise, and premature dimmer failure. The inrush current produced by LED drivers is one of the primary causes of dimmers' maximum loads. Inrush current is input current that is of brief duration and surpasses the steady-state current value during initial start-up. The current waveform of a powered-up gadget is depicted in the graph above.

An LED may be rated at 25W, but the actual wattage initially passing through the dimmer is substantially higher due to this inrush current. This means you cannot think you can utilize twenty-four 25W LED fixtures if an incandescent dimmer is rated at 600W. In this scenario, the 600W dimmer can only manage six LED fixtures because a fair rule of thumb is to allow 100W for each LED fixture.

Cheap Trim

If your electrical system satisfies all of the dimmer's requirements but you still have flickering, you can try adjusting the low-end trim. Raising the minimum dimming level by adjusting the low-end trim will lessen the likelihood of flickering and drop-out. If you are trying to dim the fixtures below the driver's dimming control range, only then will this stop the flickering.

In conclusion

LED fixtures have different minimum and maximum load requirements than incandescent fixtures. Testing must be done to ascertain the precise load requirements for a given dimmer and fixture. though you try to dim below the rating of the LED driver, flicker may still happen even though the load parameters are met. This might be fixed by adjusting the dimmer's low-end trim.
 

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