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? Last edited by vishnuvijay : 6th June 2008 at 13:13.
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6th June 2008, 13:17
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Akshay1234 Distinguished - BHPian Join Date: Dec 2006 Location: Mumbai Posts: 10,330 Thanked: 12,972 Times
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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then what is a bulb along with a pilot bulb called ? will blue light increase illumination at night ?
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6th June 2008, 13:30
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S600BENZ BHPian Join Date: Mar 2004 Location: Mumbai Posts: 304 Thanked: 12 Times
Quote:
Originally Posted by akshay1234 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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6th June 2008, 13:32
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Akshay1234 Distinguished - BHPian Join Date: Dec 2006 Location: Mumbai Posts: 10,330 Thanked: 12,972 Times
Quote:
Originally Posted by S600BENZ 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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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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6th June 2008, 13:36
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Akshay1234 Distinguished - BHPian Join Date: Dec 2006 Location: Mumbai Posts: 10,330 Thanked: 12,972 Times
Quote:
Originally Posted by vishnuvijay 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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6th June 2008, 13:36
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Chevy_lover Senior - BHPian Join Date: Mar 2008 Location: Köln Posts: 1,210 Thanked: 140 Times View My Garage
Quote:
Originally Posted by S600BENZ 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
Probably the following article & pic will be of some help: Osram Philips Bosch - H1 H4 H7 - Auto Lamp Headlight Bulbs Images X Attached Thumbnails
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6th June 2008, 13:45
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Blue Thunder Senior - BHPian Join Date: Jul 2007 Location: Right here . Posts: 1,662 Thanked: 398 Times View My Garage
Quote:
Originally Posted by akshay1234 no h4 is one bulb with 2 filaments.
This is right. Quote:
Originally Posted by S600BENZ 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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6th June 2008, 13:09 
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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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