pattayapip Posted June 16, 2021 Share Posted June 16, 2021 I have also posted this in the Car section, but maybe people here might have a better idea, worth a try Does anyone know how to dim a rear LED Car Plate like Photo attached for an example ? I know there is a fair bit of discussion on how the brightness of these things annoys/affects other road users, not debating that, just if i purchased a set how could i dim these LEDs so as not to affect/annoy anyone ? Googled a few things and seen that you can insert a resistor into the positive feed to reduce the brightness, not been able to work out exactly what i would need, or find any resistor on Lazada to order and try ? although there appear to be lots of listings, would need to know what exactly to buy, or a few to try Any help please ? Link to comment Share on other sites More sharing options...
Crossy Posted June 16, 2021 Share Posted June 16, 2021 It depends I'm afraid. If the sign has a simple dropper resistor adding another in series will happily reduce the brightness (it will get hot!). Using a PWM (Pulse Width Modulated) dimmer (readily available) will allow you to control the brightness and also won't get hot. With a fancy electronic driver then simply adding a resistor will do little, the driver will compensate until the voltage gets too low and it simply goes off. 1 Link to comment Share on other sites More sharing options...
johng Posted June 16, 2021 Share Posted June 16, 2021 The "EVEREST" display I saw (on the road) seemed to have a dimming and colour changing "thingy" already installed/built in. 2 Link to comment Share on other sites More sharing options...
sometimewoodworker Posted June 16, 2021 Share Posted June 16, 2021 3 hours ago, Crossy said: It depends I'm afraid. If the sign has a simple dropper resistor adding another in series will happily reduce the brightness (it will get hot!). Using a PWM (Pulse Width Modulated) dimmer (readily available) will allow you to control the brightness and also won't get hot. With a fancy electronic driver then simply adding a resistor will do little, the driver will compensate until the voltage gets too low and it simply goes off. For some/most mains drivers you can also add a capacitor in the supply to reduce the brightness instead of changing a resistor. I don’t have the electronic knowledge to know if this works for 12v supply lamps. 1 Link to comment Share on other sites More sharing options...
pattayapip Posted June 17, 2021 Author Share Posted June 17, 2021 Thankyou for your Replies Link to comment Share on other sites More sharing options...
Yellowtail Posted June 29, 2021 Share Posted June 29, 2021 Would you not want to install a flasher and controller such that you can make it change color? 1 Link to comment Share on other sites More sharing options...
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