Maximum current rating for blue led?

I want to buy some blue leds from digikey (haven't heard back from them yet
about this) and their catalog doesn't list the maximum current rating for
any of the leds they carry, the catalog only lists the maximum voltage
rating. How can I find out the maximum current rating without trial and
error for each individual led and without a risky potentiometer/multitester
method? I need to know the maximum current rating of these blue leds so I
can use the proper resistor with the leds so that the leds do not get
damaged. Thanks a mil!


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