Hi PhilH.
I can answer for what I wrote, not for what other modelers say.
IIf you read carefully the fourth message of the topic "Led bulb / lights" you will see that all the answers are there.
The LEDs can be powered directly at their nominal voltage.
It corresponds to the voltage drop that an LED causes when electric current passes through it.
This voltage is a factory data like the operating current. You cannot make electrical circuits with LEDs if you don't know these data.
If you are able to supply the right supply voltage direct to your LED there is no need for resistor in series with it.
Since not everyone has the ability to regulate the input voltage but simply has a battery, it may be necessary to insert a resistor in series with the LED.
You said that you bought a voltage regulator if I'm not mistaken, so you don't need a resistor as long as you supply the right stabilized direct supply voltage to the LED.
It is necessary to insert a resistor in series with the LED when the battery supplies a voltage higher than the nominal voltage of the LED.
In this case the resistor will cause a voltage drop so that the right voltage reaches the LED.
For example, if the forward supply voltage is 2 volts and you have a 9 volt battery you need to cause a voltage drop of 7 volts (9-2).
To cause the correct voltage drop you must insert the resistor with the correct ohmic resistance value.
How do you do?
It's all explained in that message with very simple mathematical operations that apply Ohm's first law.
There are also various examples with different types of batteries and with direct power supply to the LED at 2 and 3 volts.
I also explained what the advantages and disadvantages of connections in series and connections in parallel are, as well as attention to the powers involved.
For this reason, if you want me to help you, it is best to find that information and perhaps share it with images that make it clear how you connected the various components to each other.
Don't worry, these are solvable problems.
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