LED moonlight..

[RomanTaylor]

Hey, I am trying to make a moonlight for my aquarium with using 2 blue LED's.
I am using AC to DC (110V to 9.5V) phone charger to light my LED's. I assuming that blue LED's about 3.5V - 3.8V. Should be enough power... I used 150n resistor and it's working except LED's are almost blinking.. Kind of shaky light.
I know resistor is not perfect, but I am trying to find out what could cause this shaky blinking? Crappy Power Supply? Wrong resistor? Bad connection?

- AC + ^^^ + |> - + |> -

Hope somebody can help me find the problem.. Thanks in advance.

[oracleguy]

How much current can the LEDs handle? You might need to use a bigger resistor.

[RomanTaylor]

Current = 20mA
Voltage = 3.0V to 3.2V

I was little bet off, but I've found info on my led's now ^^^.

I should have something around 155ohm. I've used 5V 150ohm.
I also tried 12V 430ohm which gave same result as 150ohm. Another one I've tied is 91ohn which light it up only for a sec.
Might that be a power supply problem?

[oracleguy]

Well you'd want to use a resistance that gives you less than 20mA. So both of those other configurations you tried were still too much.

So input voltage / resistance < 20 x 10^-3.

It could also be a power supply issue or the LEDs.