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Hello,
would you please check the sentences below and tell me whether there are any mistakes there?

red - main clause
green - noun clause
orange - relative clause
blue - adverbial clause (of any kind)

New traffic lights have been developed because the existing ones are difficult to see in strong sunlight and sometimes appear to be ´on´ when actually they are in the ´off´ position.

It is claimed that the new signals overcome these problems and that they can contribute to road safety.

The new signals will look similar at a distance, but close up the driver will notice a pattern of holes
. (compound sentence)

When the new light is off, it will look a lot blacker.

The main change is in the lens, which in the new lights consists of small ´lenslets´ that channel the reflector´s light through 2000 holes in the mask.

Thanks a lot in advance
L.
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Everything is right except your last sentence. It consists of a main clause followed by a relative clause (which...mask modifying lens) with an embedded relative clause (that...mask modifying lenslets).

The main change is in the lens, which in the new lights consists of small ´lenslets´ that channel the reflector´s light through 2000 holes in the mask.
.
Comments  
Thanks a lot, Mister Micawber. I wasn´t sure of that one, although now I can´t work out why I thought it a kind of adverbial clause:-)