Improving the efficiency of the traditional incandescent lightbulb.

1. Recycling light
EPISODE 160112 / 12 JAN 2016
Step 1: Listen
You're going to hear a genuine BBC news report from 12th January 2016. Before
you listen, read these three summaries:
a) A lightbulb which uses much less energy than an older model has been
developed by scientists in the US.
b) A lightbulb which uses much less energy than an older model has gone on
sale in the US.
c) A lightbulb which uses slightly less energy than an older model has been
developed by scientists in the US.
Now listen and decide which one is correct. Listen again if you need to.
Step 2: Learn the key words and listen again
How was that? Try listening again. Here are three definitions of key vocabulary
items which may help you.
significantly
by a large or noticeable amount
incandescent
producing light from a heated part

2. prototype
the first example of a new product
Step 3: Transcript and answer
Researchers in the United States say they've developed a technique that
can significantlyimprove the efficiency of the traditional incandescent lightbulb.
They say they've built prototypes that are already three times more efficient than
standard incandescent bulbs.
Answer
a) A lightbulb which uses much less energy than an older model has been
developed by scientists in the US.
This bulletin comes from BBC World Service Radio.