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

vishnuvijay · 6th June 2008, 13:09

Helooo guys.

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

Which is better?

Akshay1234 · 6th June 2008, 13:17

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.

vishnuvijay · 6th June 2008, 13:24

than you akshay, that was quick.

you mean h4 has a main bulb and also a pilot bulb along with it?

Akshay1234 · 6th June 2008, 13:24

Quote:

Originally Posted by vishnuvijay

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.

vishnuvijay · 6th June 2008, 13:27

then what is a bulb along with a pilot bulb called ?

will blue light increase illumination at night ?

S600BENZ · 6th June 2008, 13:30

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.

Akshay1234 · 6th June 2008, 13:32

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.

vishnuvijay · 6th June 2008, 13:33

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?

badboyscad · 6th June 2008, 13:33

they are different types of bulbs:

What does H1, H3, H4, H7 etc specifications of bulbs mean?-nokyaacticwhite_chart.jpg

vishnuvijay · 6th June 2008, 13:35

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 ?

Akshay1234 · 6th June 2008, 13:36

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.

Chevy_lover · 6th June 2008, 13:36

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

vishnuvijay · 6th June 2008, 13:40

can guys tell me which type of bulbs (H1, H4 etc) fits

1. OHC
2. Wagon R

?

X-Machine · 6th June 2008, 13:40

Probably the following article & pic will be of some help:

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

X

Blue Thunder · 6th June 2008, 13:45

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.

6th June 2008, 13:09	#1
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	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.
	(1) Thanks

6th June 2008, 13:17	#2
Akshay1234 Team-BHP Support Join Date: Dec 2006 Location: Mumbai Posts: 10,265 Thanked: 12,316 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.
	(4) Thanks

6th June 2008, 13:24	#3
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	than you akshay, that was quick. you mean h4 has a main bulb and also a pilot bulb along with it?
	() Thanks

6th June 2008, 13:27	#5
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	then what is a bulb along with a pilot bulb called ? will blue light increase illumination at night ?
	() Thanks

6th June 2008, 13:33	#8
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	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?
	() Thanks

6th June 2008, 13:33	#9
badboyscad Senior - BHPian Join Date: Feb 2007 Location: TN Posts: 1,511 Thanked: 477 Times View My Garage	they are different types of bulbs:
	(6) Thanks

6th June 2008, 13:35	#10
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	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 ?
	() Thanks

6th June 2008, 13:40	#13
vishnuvijay BHPian Join Date: Apr 2007 Location: Cochin Posts: 173 Thanked: Once	can guys tell me which type of bulbs (H1, H4 etc) fits 1. OHC 2. Wagon R ?
	() Thanks

6th June 2008, 13:40	#14
X-Machine Senior - BHPian Join Date: Jul 2004 Location: Mumbai/Tokyo Posts: 1,475 Thanked: 29 Times	Probably the following article & pic will be of some help: Osram Philips Bosch - H1 H4 H7 - Auto Lamp Headlight Bulbs Images X Attached Thumbnails
	() Thanks