Bulbs are available in different sizes and different watts. These are comes in two primary types, 1) Pin type, 2) Screw type and secondary types are 1) B22,E27 - Standard size, 2) E40 - Bigger size holders 3) E14 - Smaller size holder (in Refrigerators , etc).
Lights (Panel Lights) are used in fixtures like concrete slabs, wooden ceiling and panel ceilings. The panel lights has sizes coordinated with the wattage, eg: 6W, 12W, 18W, 24W and 36W. Comes in different models eg. with frame and without frame.
Street Lights are commently used with a long steel or concrete pole (for higher positioning) to light the area in a radiation. Lumers can be selected as per the requirement (range from 30W to 600W).
Flood Lights or Flash Lights are portable lights, which can be carried from the plug point to a distance place for temporary light requirements. Also, these lights are being used to light the banners, name boards, etc.
All bulbs and lights are comes in 1) Day light, 2) Warm wight colors, which are primary.