3. a fluorescent lamp
4. an LCD computer screen (the flat screens), displaying entirely white
5. a CRT computer monitor or television set (the picture tubes with glass screens), also displaying entirely white.
Sources 1 and 2 will display a continuous spectrum, with all colors present. As for the others, not so much.
The fluorescent lamp displays a wide band of red, a wide band of green, and a wide band of blue. This is what it takes for a fluorescent lamp to step-down its UV source, through its coating called phosphors, to make what you see as white.
The LCD screen displays about 5 narrow bands, one for each of the optical primary colors (red green blue), and one for each of the optical secondary colors (yellow and cyan). It might also display a narrow violet band.
The CRT screen will display 3 narrow bands, only one for each of the optical primary colors (red, green, and blue).
Certainly sources 3, 4, and 5 are all "missing some colors", but in no way do you think the light is colored. You think it is white.
Light becomes "colored light", when the mix of all of its colors produces an IMBALANCED STIMULUS among the cone cells in your eye. As long as it produces an identical stimulus on your three cone cell types, it appears white or gray. Otherwise it will appear colored. And which color, depends on the imbalance.