R = E/I
So, .4/1.2 = .334 Should be .33 ohms. .34 is close enough and can be cobbled from 2 .68 ohm resistors in parallel
I get it! :clap: I was trying to "run the equation backwards" with .48ohms plugged in. I wasn't seeing any of the niumbers I was expecting....

Sorry, I'm leapfrogging posts.

If I run blues @ 15.1V:

1.2A x 15.1V= 18.12W each blue

3 x 18.12 = 54.36W

54.36W x 1.3 = 70.67W

Is that how you figure it? Is the PLN 60-15 just marginal to drive 3 blues, or are they just being real conservative?