Depends on you're looking for standard replacement or upgraded bulbs. If your model is the twin bulb type, then the bulb type is H7, if you're is the old single bulb model, then the bulb type is H4. Shouldn't be too hard to change just the bulbs, and it wouldn't make any effect on the light shine at all if you're just changing the bulb, unless you're talking about trying to level the lights yourself.

Changing the light bulb is just removing a fixed position bulb and replacing it.

Someone mentioned it might be either the IAFM or tappet sound

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Added on June 27, 2012, 9:37 pm
how old is your car already?...how many KM already?
my case, the mech say its the belt problem...yesterday change, the sound did dissapear but have to monitor awhile longer on cold start and when its hot...see if the tak tak sound still there or not

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Added on June 27, 2012, 10:19 pm
if the tak tak sound thn can confirm its not IAFM problem
its the belt problem....
cuz my tak tak sound isn't consistent as well...cold start will be the most obvious....thn after than it will dissapear
but mine have to confirm 1st...need to monitor mine for a few drives thn only can confirm its really the belt said by the mech

not worn i think...it just made an annoying sound only
i check the one taken out by the mech ...both the timing belt and A/C belt doesn't seem worn
none of those dried out/wrinkles as well

Sound by Tappets will increase with revs...
Suspect it's sound made by hydraulic valve lifters used in Campro...kinda loose? 

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Added on June 27, 2012, 10:51 pmps. Goodnight, Everyone!!

Hi...
Yup, it can happen 2any car with hydraulic valve lifters...ole gen Sagas din't hv...
BLM & later use hydraulic valve lifters...that's why not need 2adjust valve clearances during service intervals. So ...the Good & the Bad? 

Pls chk out these vids re noises made by such lifters :
1.
2.
3.
4.

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Added on June 28, 2012, 1:08 pmps. My FL has those sounds...obvious esp when cold...
Mech @SC told me it's ok & need 2change only when VERY noisy...

yes it is normal for CAMPRO to develop d hydraulic lifter's sound. mine started to develop around 40k mileage. solutions? try complain to SC if under warranty. some SC replace d lifters (16 pcs) while some SC replace d whole engine head. they did d later for me. if cant claim then just hv to live with it. use thicker oil n change every 5000km.

personally i find using semi-syn 10W-40 a bit too thin n can hear d tappet sound. tried Shell, Castrol n Petronas all same result. abit of history of my car:

factory filled oil was Petronas Mach 5 20W-50. found d engine heavy n FC very high (maybe engine still tight). so at 1st, 2nd n 3rd service, i use Castrol GTX 15W-40. very smooth. engine revs better n improved FC.

starting 4rd service, i swith to Castrol Magnatec 10W-40. can hear engine abit louder. then subsequently also tried Shell HX7. tappet sound stated to develop ard 40k km n get worse as mileage increase.

then at 45k service made a complain at SC. they agree to help me submit a claim under extended warranty as it's already after 3 years factory warranty. use back Castrol GTX 15W-40 while waiting for warranty n surprisingly d tappet noise reduced n engine quieter.

changed new engine head at 48k km n SC uses Petronas Syntium 10W-40. no wierd sound but engine abit loud. at 54k km tried Petronas Syntium 10W-40 again. then slowly can hear slight tappet sound again!!

recently at 59k, changed bac to Castrol 15W-40. also add abit of tufoil. engine turned quieter n tappet sound gone!!

Conclusion (at least for my Campro)  = 10W-40 abit too thin. will stick to 15W-40 for d coming services.

i dn't think its that cheap
and it depends on which kind of bulb u want
and as saga FL...u need 2 bulb each...meaning total of 4 H7 bulb
your bulb how old already?..so fast die already?