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please advise me to improve my head light for better lighting. original toyota carina AT 150 square type 55W lamps available and its difficult to drive in city areas and also rainy and misty areas. what you think about HID? or any other option..? if i modify my lights, existing battery and alternator can bare this additional load?

can i replace existing 55W bulbs with 100W bulbs for this?

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What year of Carina is this? You must be talking about the 86 you mentioned in your previous post. – ᴘᴀᴜʟsᴛᴇʀ2 Jun 26 '14 at 12:28
One thing that can greatly affect the amount of useful light coming from your headlamps is the clarity of the plastic/acrylic lens cover (the part of the headlight that you can touch from outside the car). On many cars, the lens cover loses clarity and becomes gradually more hazy and "milky" over time, reducing the effective light output of the lamps. Are your lens covers clear and in good condition? – RSW Jun 26 '14 at 13:33
@RSW ... If what I've seen is correct, the Carina does not have lens covers which can be affected by sunlight, but rather they are a self contained bulb with a glass lens. – ᴘᴀᴜʟsᴛᴇʀ2 Jun 26 '14 at 18:37
There may or may not be legal problems if you decide about swapping/retrofitting to a different illumination type. Unfortunately, I don't know if there are any and I have no idea if this is the proper place to ask that question. – Ellesedil Jun 26 '14 at 19:01

As I said previously, a set of Osram bulbs would help a lot. Further to that, your headlights may just need a nice polish. Some people try to get real fancy with products and methods, but what it really comes down to is that you need to use various grades of sandpaper (from rough to very fine) and finish off with rubbing compound and/or liquid polish (I use Brasso, but any liquid polish should work).

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If what I've seen is correct, the Carina does not have lens covers which can be affected by sunlight, but rather they are a self contained bulb with a glass lens. – ᴘᴀᴜʟsᴛᴇʀ2 Jun 26 '14 at 18:37
You may still find that a good polish will remove the crap that sticks to your headlights. – Juann Strauss Jun 27 '14 at 6:55

It is worth making sure that the bulbs are getting their full voltage - Halogen lamps drop off in brightness significantly as voltage drops.

Many cars of that age didn't have relayed headlamps, and so as the wiring has aged, it's resistance has increased, and the performance of the headlamps will suffer - fitting relays close to the lamps with new, good quality wiring can often help.

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Very good point. – ᴘᴀᴜʟsᴛᴇʀ2 Jun 27 '14 at 11:31
thanx! I will check with those points. – tenna Jun 30 '14 at 6:36
@Nick C , I decide to re-wire the all system with relays. I will add my result within few days.... – tenna Jul 2 '14 at 10:06
Does wire really increase in resistance with age? What mechanism would cause this? – Nate Eldredge Jul 28 '14 at 15:59
As the wire gets older, it corrodes. This reduces the cross-section of the wire (as some of the copper has turned into copper oxide), and so increases the resistance (resistance being proportional to length divided by cross section) - put simply, the wire is smaller so less electrons can fit through it! – Nick C Jul 29 '14 at 9:58

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