Are traffic lights made up of lots of little lights or one big one?

It looks like the green and red lights are made up of lots of little lights, but the yellow muted is made up of one bulb and a piece of yellow glass.

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Older light systems used 1 clear uld with a colored lens.

Newer systems hire multiple colored (Red, Yellow and Green) LED's, sometimes 100's, in place of the single clear bulb and lens.
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Answers:    It depends where on earth you live, larger cities are using LED's and you can tell because you can see all of the little LED's. There are masses advantages with LED's They consume less punch are brighter, don't create a lot of heat, and the turn on instantly. I've posted two links below where on earth you can see the difference.
Older light systems used 1 clear uld with a colored lens.

Newer systems hire multiple colored (Red, Yellow and Green) LED's, sometimes 100's, in place of the single clear bulb and lens.
what they said.
ftw
our new chinese video:
http://youtube.com/watch?v=EtfiQPXwRg4

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