Have you read the guidelines about how to use this forum?
If so you did not read the bit about picture sizing.
Mind you they are a bit useless anyway.
30~46VDC, 0.65A ..... I figured that using a MOSFET alone would not be sufficient.
Why not power FETs can easily handle this small current at 46V.
What you are missing is information about your LEDs. Do they have a driver in them already? Most systems do, in which case it is hard to tell how they would react to having their input voltage PWMed.