Exactly what does H1, H3, H4, H7 etc requirements of bulbs suggest?

Exactly what does H1, H3, H4, H7 etc requirements of bulbs suggest?

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Exactly what does H1, H3, H4, H7 etc specs of light bulbs mean?

Which will be better?

6th June 2008, 13:09 number 1
The following BHPian Thanks vishnuvijay for this helpful post:
6th 2008, 13:17 #2 june
Listed here 4 BHPians Thank Akshay1234 with this of good use post:

Than you akshay, which was quick.

You suggest h4 possesses bulb that is main additionally a pilot bulb along side it?

6th June 2008, 13:24 number 3

Than you akshay, which was quick.

You suggest h4 includes a bulb that is main additionally a pilot bulb along side it?

6th 2008, 13:24 #4 june
The next 4 BHPians Thank Akshay1234 because of this of good use post:

Then what's a bulb along side a pilot light light bulb called?

Will light that is blue lighting through the night?

6th 2008, 13:27 #5 june
6th 2008, 13:30 #6 june
6th June 2008, 13:32 # 7
The next BHPian Thanks Akshay1234 because of this of good use post:
6th 2008, 13:33 #8 june

These are typically various kinds of light light bulbs:
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6th June 2008, 13:33 number 9