These use a quarter of the energy of regular bulbs.

To prevent this a high impedance indicator must be used; a regular incandescent bulb has too low resistance.

Felix puts on the regular bulbs on his vehicle, and continues his travel.

The kitchen was lit with regular bulbs turned low and they were kinder to her skin than the bright office halogen had been.

But the latest diodes last 50 times or longer than regular bulbs, and they are rapidly becoming more energy efficient.

When the seed is struck by sunlight (or light from a regular incandescent bulb) the phytochrome changes.

He conserves energy by using compact fluorescent bulbs - "they last 10 times longer than regular light bulbs."

They're a pricey $10 apiece, but they're meant to last five times as long as regular bulbs.

The Saf-T-Guard line costs $3 to $12, about $1 to $2 more than regular bulbs.

What is the main reason why a regular incandescent bulb is not energy efficient?