Im not sure about the mega, but the 328 based units seem to be limited to 500ma at the 5v pin. My guess is that 1.3a is going to too much, even for the mega. I think that the 5v pin limit is from the specific voltage regulator that is used (the part right next to the external power socket.)
Too bad... Well, then I'll just connect the LED driver board directly to the power supply unit.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16