If it's a 1N4001 diode then it depends on the current of your load...
I have no idea what kind of diode you are referring to.... :-?
If you are referring to a Laser Diode of a specific wavelength...
then that info is surely in a thread/post on the forum...
I suggest that you take the time to read the information on the forum
thread/posts and if the information you require is not posted...
Then... by all means ask....
The Search Button is your friend....
[EDIT] BTW... you didn't even read the replies to the similar questions
you asked in other threads... opening a new thread to ask the same
question will give you the same results...