Explanation:

Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps: This statement is correct. Sodium lamps, specifically High-Pressure Sodium (HPS) lamps, emit light in a 360-degree pattern. In contrast, LEDs emit light in a specific direction. This makes LED lighting more efficient for many applications since it can be directed where needed.

As street-lights, sodium lamps have longer life span than LED lamps: This statement is incorrect. LED lamps generally have a much longer lifespan than sodium lamps. While High-Pressure Sodium (HPS) lamps may last around 20,000 to 24,000 hours, LEDs can last up to 50,000 hours or more.

The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting: This is correct. Sodium lamps, especially Low-Pressure Sodium (LPS) lamps, emit a narrow spectrum of light, which is almost monochromatic yellow. This is not ideal for color rendering, meaning it doesn't accurately represent the colors of objects under its light. On the other hand, LEDs can produce a broad spectrum of light, resulting in better color rendering. This makes objects under LED light appear more natural to the human eye.

the correct statements is 1 and 3 only.