Hi I am currently in the process of going to build a led light for my marine fish tank. I am going to be using 48 cree LEDs fed from 4 meanwell eln-60-48d drivers.
The drivers output 48 volts with a slight adjustment. They also output 62 watts. The current drive is max 1.3A. The units are 0-10 volt dimmable. Looking at the units they are 0 output with dimmer voltages below 1.5 volt.
Therefore I am planning on using lm317 chips with a potentiometer to vary the dimmer voltage. I am wondering I am looking to vary the voltage from 1.25 to 10 volts. I do know that the R1 is usually around 240 ohm I am looking at the possibility of using R1 at 680 ohm with a 4k7 ohm potentiometer to achieve the voltage shift I am looking. Or I can use R1 at 160 ohm with a 1k potentiometer. I am wondering which setup would work best with the lm317?
I was thinking of using a 12 volt dc supply to supply the power for the dimmer circuit and I'm wondering if it is possible to use the same power supply for all 4 dimmer circuits and if so what is the best way to wire it up? I am not from an electronics background but can usually work most things out.
Also is it possible to use the output from the drivers to power the dimmer circuit? I know the lm317 chips can accept upto 37 volt and my drivers output more than this but wondering if it can be stepped down to suit?
Eventually I plan to rework the dimmer to run from an arduino output. This will allow me to stimulate a sunrise and sunset in the tank. However at present the dimmer circuit will simply be for adjusting the colour blend of the 4 strings of LEDs. I plan to control the on and off with timers. If I do use a separate 12 volt dc power supply do I simply have this switched on and off with the first timer?
Finally if anyone has any other suggestions or better ways of doing this the input would be really appreciated.
Thanks in advance for any replys.
Cheers for taking the time to read this.
Keith
The drivers output 48 volts with a slight adjustment. They also output 62 watts. The current drive is max 1.3A. The units are 0-10 volt dimmable. Looking at the units they are 0 output with dimmer voltages below 1.5 volt.
Therefore I am planning on using lm317 chips with a potentiometer to vary the dimmer voltage. I am wondering I am looking to vary the voltage from 1.25 to 10 volts. I do know that the R1 is usually around 240 ohm I am looking at the possibility of using R1 at 680 ohm with a 4k7 ohm potentiometer to achieve the voltage shift I am looking. Or I can use R1 at 160 ohm with a 1k potentiometer. I am wondering which setup would work best with the lm317?
I was thinking of using a 12 volt dc supply to supply the power for the dimmer circuit and I'm wondering if it is possible to use the same power supply for all 4 dimmer circuits and if so what is the best way to wire it up? I am not from an electronics background but can usually work most things out.
Also is it possible to use the output from the drivers to power the dimmer circuit? I know the lm317 chips can accept upto 37 volt and my drivers output more than this but wondering if it can be stepped down to suit?
Eventually I plan to rework the dimmer to run from an arduino output. This will allow me to stimulate a sunrise and sunset in the tank. However at present the dimmer circuit will simply be for adjusting the colour blend of the 4 strings of LEDs. I plan to control the on and off with timers. If I do use a separate 12 volt dc power supply do I simply have this switched on and off with the first timer?
Finally if anyone has any other suggestions or better ways of doing this the input would be really appreciated.
Thanks in advance for any replys.
Cheers for taking the time to read this.
Keith
