Hi! I am brand new to large format photography and have not even made my first exposure yet! I'm using an old 4x5" Anniversary Speed Graphic and I am wondering now whether I should use my "flash bulbs" 3 cell Graflite + sidelight (courteously of course ) -or- if I should try and use "Available Light". I'll be using Tri-X 400 and shooting dimly lit interiors (some with no windows) and they will include people. These will be more or less environmental grab shots taken with permission of the shop owners and their customers. How would you approach this problem? Looking forward to hearing from the experienced. Thanks!