How strong does the studio flash need to be in order to flash with enough light in the Hilite Lastolite 180x2015? My plan would be to work with only one flash in the Hilite and one flash (Richter Nona 125W) from the front to expose the model. Is the Elinchrom D-Lite RX ONE enough? As I am a family photographer and also shoot newborns, my desire is to imitate a bedroom with window light. It doesn't have to be absolutely highkey. (I want to keep my equipment lean, so I hope to get by with 2 flashes). Thank you very much.