# Effect on LED driven at a higher Voltage than maximum forward Voltage

My current PCB configurations are (10 series 4 parallel)x3 in parallel making 10 series and 12 parallel I am using Meanwell ELG-75-42 driver giving a voltage of 42V at 1800mA, and a power of 75W. It is a constant current + constant voltage driver.

While each LED is driven at 150mA dropping a voltage of 3.0V so a total of 1800mA and 30V,

LED specs
typical current-150mA
typical voltage-3.0v
maximum voltage-3.6v
As the voltage is going higher than maximum will it affect my LED's?

• Take your time to read what you wrote and try and make it more structured. I can't understand what you are trying to say here. Oh, and schematics. Provide them, it's hard to help without being able to see what you are talking about. – Joren Vaes Jun 15 '17 at 12:22
• Short answer, if you go over your rated voltage your LEDs will fail. Depending on how much, it's either quitly (they just stop working) or with a nice "pooof" and smoke and charred everything. – Joren Vaes Jun 15 '17 at 12:24
• Please add some punctuation to the second paragraph and a question mark to the actual question so it's clear what exactly you are asking. There's a schematic button on the editor toolbar if required. – Transistor Jun 15 '17 at 12:24
• If you're trying to actively control the voltage supplied to your LEDs you're already doing it wrong. LEDs are current controlled devices. Set your supply to provide the correct current and as long as it is capable of providing a high enough voltage to provide an acceptable Vf to your series string of LEDs, it will be fine. – brhans Jun 15 '17 at 12:33
• @brhans The current I provide is fine calculated at 150mA which is the typical current for the LED. Query is about the driver being 75W and so the Voltage is 42V at 1800mA. My thinking is that the voltage each LED gets is 4.2V as 10 LED's are connected in series. The maximum voltage for the LED is 3.6V – Nihar Patel Jun 15 '17 at 13:03