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how can I tell what kind of light bulbs are in my street lights?
i want to find out if they're high pressure sodium, low pressure sodium, or something else? how can i do this?
1 Answer
- Steve BLv 51 decade agoFavorite Answer
Low pressure sodium lamps will emit dim pink/red light when turned on and then bright yellow after the sodium heats up.
High pressure sodium lamps will emit dark pink when turned on and then pink-orange light when warmed up. These are the most common.
Metal halide lamps are a true white light, but less common because of their low efficiency compared to sodium lamps.
