** The OP simply does ** NOT ** have an " inrush current " problem.
His laser colour printer draws very high AC current for many seconds while it heats part of it's mechanism from time to time.
Even a small, B&W model will draw 1kVA doing this.
The solution is to either stabilise the AC supply to the lamps in use, or, simpler still, use the damn lights installed in the ceiling - as they are normally on a separate circuit.
....... Phil