What is the Lens for?

Both regular incandescent bulbs and halogen bulbs create light by heating a filament (made of tungsten) inside the bulb; the heat makes the filament white-hot, producing the light that you see. Usually, the bulb burns out when the filament wears out. The filament on a regular incandescent bulb wears out over time because the tungsten on the filament evaporates and is redeposited on the bulb's glass. (This is also why bulbs often appear darker when they burn out; what you're seeing is tungsten ...

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Usually refers to the screw base typically used in household incandescent lamps. There is also the medium bipin base commonly used in T12 and T8 fluorescent lamps.

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ECE R37 CodeThe European Common Market Regulation 37 is the standard lamp number usually printed on the glass lens of bulbs manufactured in Europe.European Common Market Regulation 37 standard lamp number as (ECE R 37) or in code.

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Light that is not aimed properly or shielded effectively can spill out at into areas that don't want it:  It can be directed towards drivers, pedestrians or neighbors. It is distracting and annoying and can sometimes be disabling.

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Lumens/WattsA ratio expressing the luminous efficacy of a light source. Typical lamp efficacies: Thomas Edison's first lamp - 1.4 lpW Incandescent lamps - 10-40 Halogen incandescent lamps - 20-45 Fluorescent lamps - 35-105 Mercury lamps - 50-60 Metal halide lamps - 60-120 High-pressure sodium lamps - 60-140 Note: The values above for discharge lamps do not include the effect of the ballasts, which must be used with those lamps. Taking ballast losses into account reduces "syste...

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