I will follow the wiring that you posted above. The only difference using TWO relays instead of the
(DPDT) RELAY you used, is that I have to trigger BOTH relays with PIR signal ( using NPN Transistor) and short circuiting pins following your schematic, will provide the latching. ( is that true ????)
I assume that I need only ONE momentary switch to do the unlatching which will provide the lamp on/off function.
I will do it as I explained here and hope for the best.
P.S. May be..Just may be ...people prefer using microprocessor to do what I am trying to do. Just a thought !!!