Model # NA440
Is there a way to have the light stay fixed on one color?
No, the floating solar lights are designed to continually rotate through the colors and cannot be fixed on a particular color.
Are these lights bright enough to light up a pool size of 18'X 4' at night. I have 2 daughters that love to swim in the pool but there is no light in there for them at night. Will this be bright enough for them to still enjoy the pool at night
These lights are more used for a decorative purpose. I do not recommend using them as your main light source. I think you would be better off with the Nightlighter NA410 if you are looking for nighttime swimming.