LED street lighting control system

Thread Starter


Joined Feb 7, 2018
Hi everyone,
i need your advice on a project i’m working on.

i have an LED street light (3.8V , 700mA) which i need to make a control system for it.
1- is it better to drive the LED by a switched mode regulator with constant current or constant voltage regulator?
2- i’m using PWM to dim the LED, so my choice is a constant current regulator, since i’m turning the driver on and off at high frequency from a PWM signal coming from the Arduino. am i correct?

i looked up through these information, but i just need some more explanation.


Thread Starter


Joined Feb 7, 2018
hi G,
Welcome to AAC.
I am assuming that the power source will be from the local mains supply.?
I would choose a constant current source, set for 700mA and use PWM for dimming, it will be more efficient than a CV source.

Do you plan to design and build your own CC and PWM modules.?



You may find this link interesting.
the street light will be powered from a battery which will be charged from a solar panel.
on the specification of my street light, the power for the street light is 150W (700mA,3.8V) (number of led's = 64)

here's the problem, i don't want an inverter, most drivers i found accepts an ac input voltage or some just can't allow for 150w load, exceeds the maximum allowable power, do you have any suggestion regarding this?


Thread Starter


Joined Feb 7, 2018
Is this a school/college project? The LED rating seems pitifully low for a practical street light.
i forgot to mention that the power for the street light LED is 150w (700mA , 3.8V ) - number of LED's = 64
the LED also will powered from a battery charged by a solar panel.


Joined Sep 17, 2013
A quick glance at street light ads suggests 60W is about the max normally used. Why do you feel the need for 170W?
A 170W light is going to need a pretty big solar panel to recharge the battery.