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Old 6th June 2008, 13:09   #1
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Default What does H1, H3, H4, H7 etc specifications of bulbs mean?

Helooo guys.

What does H1, H3, H4, H7 etc specifications of bulbs mean?

Which is better?

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Old 6th June 2008, 13:17   #2
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they are all different bulb sizes. there isnt any better or worse. it just depends on which size your car has. h4 has both high and low beam built into one. h7 and h1.etc have only 1 beam.
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Old 6th June 2008, 13:24   #3
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than you akshay, that was quick.

you mean h4 has a main bulb and also a pilot bulb along with it?
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Old 6th June 2008, 13:24   #4
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Quote:
Originally Posted by vishnuvijay View Post
than you akshay, that was quick.

you mean h4 has a main bulb and also a pilot bulb along with it?
no h4 is one bulb with 2 filaments.
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Old 6th June 2008, 13:27   #5
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then what is a bulb along with a pilot bulb called ?

will blue light increase illumination at night ?
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Old 6th June 2008, 13:30   #6
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Quote:
Originally Posted by akshay1234 View Post
no h4 is one bulb with 2 filaments.
No thats not true. It has only 1 filament, but has something like a reflector built into the bulb which moves when you shift the stalk in the car and thus changes the focus from High Beam to Low Beam.
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Old 6th June 2008, 13:32   #7
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Quote:
Originally Posted by S600BENZ View Post
No thats not true. It has only 1 filament, but has something like a reflector built into the bulb which moves when you shift the stalk in the car and thus changes the focus from High Beam to Low Beam.
i dont think thats right. thats what happens in hi/lo HIDs. i dont think normal h4 halogens have this moving reflector thingy.
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Old 6th June 2008, 13:33   #8
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in a headlight there are two bulbs. the main bulb and a pilot/park bulb. right? so do these come as one set or do we buy them seperately?
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Old 6th June 2008, 13:33   #9
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they are different types of bulbs:

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Old 6th June 2008, 13:35   #10
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thank you.
so that means the main bulb and the pilot/park bulb don't come as a set and that you'll have to buy them seperately ?
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Old 6th June 2008, 13:36   #11
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Quote:
Originally Posted by vishnuvijay View Post
in a headlight there are two bulbs. the main bulb and a pilot/park bulb. right? so do these come as one set or do we buy them seperately?
i have seen them as a set by philips. i thin they were blue vision. but you do also get the pilot bulbs separately for around rs150 or so for 2 leds.
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Old 6th June 2008, 13:36   #12
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Quote:
Originally Posted by S600BENZ View Post
No thats not true. It has only 1 filament, but has something like a reflector built into the bulb which moves when you shift the stalk in the car and thus changes the focus from High Beam to Low Beam.
H4 Xenon has two filaments. One for high beam and one for low beam.

Please see this link. http://www.morepower.com.au/images/H...%201%20(2).jpg
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Old 6th June 2008, 13:40   #13
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can guys tell me which type of bulbs (H1, H4 etc) fits

1. OHC
2. Wagon R

?
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Old 6th June 2008, 13:40   #14
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Probably the following article & pic will be of some help:

Osram Philips Bosch - H1 H4 H7 - Auto Lamp Headlight Bulbs Images

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Old 6th June 2008, 13:45   #15
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Quote:
Originally Posted by akshay1234 View Post
no h4 is one bulb with 2 filaments.
This is right.


Quote:
Originally Posted by S600BENZ View Post
No thats not true. It has only 1 filament, but has something like a reflector built into the bulb which moves when you shift the stalk in the car and thus changes the focus from High Beam to Low Beam.
No, S600BENZ, you are wrong there.

In the H4 bulb, as akshay1234 has mentioned, there are two filaments : one for the high-beam, and the other for the low-beam.
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