siangmh said:
Ohhh Yessss baby! Finally got some brialliant input, just lights up my bulb liao haha ha
It is really refreshing having such good point out! Thank a million bro astalavista_baby!!
I really dont know how to say TQ bro :>
However, i still got some doubts in my mind, if u dont mind & have d time, could u help me to clear these doubts also? Thanks in advance!!
1) Intensity (measure in Candela)
~ What does it mean? is it measures how big/bright d light produced when the current jump from one electrod to the other? like measure how big the spark is?
~ Or is it mean how much the unit of current can store before it discharge thru those electrods? Hence more candela = stronger discharge = stronger light?
~ Can give example?
2) No. of Lumens & No. of Candela
~ How would we know the no. of Lumens & no. of candela of different brands HID in d market ? as most of them dont state it.
~ How to compare brightness then?
3) Glare Shield
~ Is this necessary in a good quality HID?
~ Why d glare shield was put underneath the buld instead of putting it above d bulb? wouldn't it be better to put above the bulb?
4) Focus of light
~ Does a good qlty HID will automatically have good focus of light?
~ Or all HID will also scattered its light?
~ Does HID have good cut-off of lights? ie when shoot HID lighting on the wall, can see a very clear division between the area that shined by light & those that not shine by lights.
~ I heard only HID with projector casing like those BMWs can have good focus, else w/o projector casing, will be scattered. Is this true?
5) Adjustment of light / Bulb position
~ I was told by accs shop ppl that wira's bulb position was fixed, what they can do to adjust lighting to shoot lower is adjusting the lamp casing to face lower only.
I was not satisfy with this sort of adjustment while d bulb is also H4 base, same as ori. Is this d right way?
~ What is the right way to adjust the HID lighting, for w/o projector car eg Wira & for those with projector, eg Waja?
6) Cost & Performance
~ I seldom see ppl selling new Philips / Osram HID especially H4 (except those used/ rejected D2S/C/R HID that dunno where they sourced from...) Why? Too expensive?
~ Those rm500-700 China/Taiwan made HID got good ones or not? Any recommendation of these cheap ones?
7) Water Proof Ballast / Wiring
~ Can wash engine bay using jet pump with HID installed?
~ Is it recommended to siliconed sealed all the wire connections & the ballast casing? or cover ballast inside plastic bag?
No problem, that's what ZTH is for. That's a lot of question you have there, lol. I don't claim myself to know everything but I will try my very best to explain based on what I know. All answers are numbered based on your questions.
1) From what I know, the intensity is not measured by the stronger spark or by the discharge. Basically it is the light that is produced. The more intensed the light is, the higher the candela. 1 candela is t[SIZE=-1]he unit of measure for the intensity of light at the source roughly equal to the amount of light in any direction from the flame of a candle. So the more candela, you do the math. Anyone knowing more, feel free to add in. :D
2) There is no way I know of that you can tell the candela or lumens if they do not state it. The only way is if you have the light measurement machine, that would give you the readings. Puspakom/JPJ have those, I believe. :)
3) If you are talking about the glare shield that comes with H4 bulbs which they locate underneath the bulb, yes it is necessary. This is similar to the mechanism used in the halogens. If you notice, there is a shield under the filamens of a H4 bulb.
The reason it's put underneath is to shine the light upwards into your headlamp reflectors which will then shine the beam to the road. Correct me if I am wrong here.
4) Theoritically, good HID bulbs are manufactured with precise bulb optics and should hence give you an even light beam with minimal glare, if not at all. Poorly manufactured bulbs will suffer from glare as the optic points are slightly off.
Generally, HIDs were intended for projector headlamps or probably reflectors designed with proper cut off point. On reflector headlamps, you don't get precise cut off points. Yes, you can see the distinct line which divides the bright light and the little light above it which some will interpret as glare. It's like the halogens. If people drive behind you, you do not feel the glare but if you stop at a traffic light and look at your car roof top, you'd notice dim lights from other vehicle headlights. Same goes to reflector HIDs, except that it's brighter.
The projectors on the other hand, if manufactured properly would have a perfect cut off line. Then again, it also depends on the HID bulbs. With poor optics engineering, the beam will still go uneven.
5) No idea about this one, but basically, all cars have a fixed bulb position but should have an adjustable headlamp. Headlamps can be adjusted hi/lo as well as left/right. I am pretty sure the Wira has that adjustment as well. It's 2 screws on the headlamp. Do a search in the forum. I am quite sure someone posted a picture before.
Again, whether or not you want to use HIDs with a projector headlamp or not, that all depends on you. Please refer to point number 4.
6) Yes, there are a number of people selling but most do not and yes you're right, a set of Philips HID with modified H4 base will sell anything above RM2K.
Cheap HIDs are available but they generally don't last that long and probably has cheap bulbs. It's all up to you. Another alternative is to get the Aura range of HIDs. They have good reviews and they come from Australia. A set of low beam H4s will set you back about RM1.8K. Read the review by Tom. IT gives you a general idea. Head over to http://www.auraxt.com.au/ for more information.
I don't have any cheap HIDs to recommend as I really wouldn't go for them if I can spend more cash.
7) I am not sure if you can use HIDs with a jet pump. I have never tried but I don't think it should be a problem.
Basically most ballasts nowadays are waterproof and no, you don't put them in plactic bags. It's funny and the ballast might heat up during operation. The wires should have been sealed with rubber and there should be some kinda rubber seal that comes with the HID kit to cover the hole leading to you headlamps to prevent water from going in.
I hope this clarifies your doubts and like I said, I am no expert in this and if there is something wrong, do not hesitate to correct me. Thank you and cheers. :)
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