If the diode driver has two pots, one is most likely the current adjust, and the other is probably the blanking gain. Do you know if this driver's blanking is TTL (full on/off) or analog (brightness is variable)? If there are no markings, it would be hard to determine which pot is doing what without a meter. If you have a meter that can measure current, then you are good to go. The bad thing about playing with the pots, if you don't know what they do, is that you might over-drive the diode. 445's are pretty tough, but you can still turn them into an LED if you over-drive them too much. My advice is to find a meter that measures current... they rest is easy and anyone here could walk you through it.
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