Light from older fluorescent lamps can look harsh and unnatural. Why is this? Qu

Question

Light from older fluorescent lamps can look harsh and unnatural. Why is this?

Question 24 options:

No phosphor used on older lights – they just use the emission spectrum of mercury.

The phosphors emit the same spectrum (range of wavelengths) as sunlight, but the light is much more intense making it unpleasant to the human eye

In older fluorescent lights the phosphor quality is not as good and wears out very quickly.

Older fluorescent lights do not use mercury – they use a different atomic vapor that excites different transitions in the phosphor atoms.

The phosphors approximate white light by emitting a few wavelengths rather than a continuous BB spectrum. In older lights poor quality phosphors were used and so this approximation was not very good.

A)

No phosphor used on older lights – they just use the emission spectrum of mercury.

B)

The phosphors emit the same spectrum (range of wavelengths) as sunlight, but the light is much more intense making it unpleasant to the human eye

C)

In older fluorescent lights the phosphor quality is not as good and wears out very quickly.

D)

Older fluorescent lights do not use mercury – they use a different atomic vapor that excites different transitions in the phosphor atoms.

E)

The phosphors approximate white light by emitting a few wavelengths rather than a continuous BB spectrum. In older lights poor quality phosphors were used and so this approximation was not very good.

Explanation / Answer

The phosphors approximate white light by emitting a few wavelengths rather than a continuous BB spectrum. In older lights poor quality phosphors were used and so this approximation was not very good.

The phosphors approximate white light by emitting a few wavelengths rather than a continuous BB spectrum. In older lights poor quality phosphors were used and so this approximation was not very good.

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