How muc the power consumption will be in LED Light?

[neduva]

Hello
I tried to design a LED light. I found two types of circuit.

1) with step down transformer and voltage regulator.
2) Without transformer by using capacitor and resistor alone.

Which one is better one?
If i'm using 3 white LED of 3.6v each.

 

[tpetar]

What power supply you have ? What is primar voltage ?


Always is better to use transformer as isolation device, but if you have less space for device, you can use capacitor/resistor to lower mains voltage (if you mean on that).

 

[neduva]

I'm giving the same 230Vac as input supply. Is transformer method consume more power than resistor/capacitor method.

 

[tpetar]

I'm giving the same 230Vac as input supply. Is transformer method consume more power than resistor/capacitor method.

Best power saving is with switch in Off state. :smile:

Transformer is best solution if you have transformer and needed space for that. Also switching psu can be very good solution.

You can decrease voltage from 220V to some LED voltage with capacitor and resistor no problem, what LED you plan to use and what current? You say 3 white led at 3,6V each ok, what current ? I supose 3 led are in serial connection.