Dorcy International p6V Floating Luminator Lantern with 6V HD Battery "luminate" Questions

How is a flashlight both luminous and nonluminous at the same time? It's my science homework and I'm not sure how a flashlight can be both luminous and nonluminous. At first light it DOES sound a bit ...

how do you install 6V battery into Dorcy luminator I put new 6V in but it won't screw on right? I forget how old battery was positioned. How do you screw lid back on ? I was just having the ...