Can I watch with a lamp on, or outside before it's fully dark?
Only with a bright projector or a small picture. A dark room needs about 16 foot-lamberts on the screen, which is roughly 475 ANSI lumens for a 100-inch picture. A lamp nearly doubles what you need. Outdoors, wait until 30 minutes after sunset.
about 475 ANSIlumens for a 100-inch picture at the 16 fL cinema target (our calculator, SMPTE reference level)




