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குண்டு பல்பு ஏன் மஞ்சள் கலர்ல ஏறியுது தெரயுமா Why Incandecent Lamb has Yellow Lights

1,863 views · Published 5 July 2018 · 4:25 · Indexed 23 September 2026

Channel: Tech Doct · 2018 · Education

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An incandescent bulb (classic) works by heating the tungsten filament. When you heat something, it will begin to glow, first in infrared we feel as heat, then in colors we see in the rainbow, starting with deep red, then orange, yellow, and white. Higher temperatures produce blues and ultraviolets, but by this time most metals are melted. Even with tungsten, one of the metals with the highest melting point, the temperature where it glows white, makes the metal very fragile. It breaks easily.

So, to make bulbs last longer, they make them so they burn at a lower temperature and glow with a yellow/white color.

But some people wanted white light, so manufactures started making bulbs that gave different colors of light and the color depended on the filament temperature. These are called “bright white bulbs” and have a shorter life than the more yellow long lasting bulbs.

It is common to find a “color/temp” rating on the bulb. Paint stores often show off colors charts that show what the paint looks like under different temperature lighting. When materials other than tungsten glow, they have a different spectrum of color. You can use a spectroscope and identify what the material is by this spectrum. It works sort of like a fingerprint.

Here are Wikipedia articles related to color/temperature. They are pretty scholarly and explain this in detail.

Color temperature - Wikipedia

Standard illuminant - Wikipedia

Sometimes incandescent light bulbs will be even more noticeable yellow because the utility power is low. Voltage at a service can vary quite a bit.

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குண்டு பல்பு ஏன் மஞ்சள் கலர்ல ஏறியுது தெரயுமா Why Incandecent Lamb has Yellow Lights

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