Looking through some of the main online bulb suppliers, I noticed that one had 80 watt H7s  not road legal, but was just wondering if they would interfere with the wiring of the can bus, they come with a years warranty.

 

H7 OSRAM Super Bright Premium Rallye Off-Road 12V 80W 477 Halogen Bulb

Melty Melty. Yeah it will probably be the plastic housing, reflector and lense that will suffer more due to the extra heat produced. Gone are the days where the metal and glass units would take it in their stride, I used to run 4 x 100 watt bulbs in my capri with 150 watt bulbs In the spot lights. Back then it was easy to beef up the wiring but with canbus and all being interconnected it's almost impossible. 

Edited 23 February, 20206 yr by caprixpack

Probably everyone will going to be mad on you. 

H7 is low beam  - so with 80w bulbs you will blind everyone. 

No. Don't do it.

 

Who knows what it will melt. If not the headlight itself, probably wires, connectors.

 

Get a normal wattage stronger bulb, like Philips Vision Plus or how it is called now, or similar.

Facelift cars use H7 as main beam as well as low beam, but I agree with no!!!

 

I have Philips Racing Vision H7 bulbs in mine and I am very happy with the result.

On 23/02/2020 at 02:34, skippy41 said:

Looking through some of the main online bulb suppliers, I noticed that one had 80 watt H7s  not road legal, but was just wondering if they would interfere with the wiring of the can bus, they come with a years warranty.

 

H7 OSRAM Super Bright Premium Rallye Off-Road 12V 80W 477 Halogen Bulb

Hmmmm well, there's 2 ways to look at this

 

The theoretical approach:- as above

 

Or the practical approach:- as below

 

I ran 100w H7's for 2 years & there were 2 positives.

 

1. I saw further down the road

2. I never had to demist my head lights😂😂

Many years ago in a Renault 5GT Turbo I ran 100/80W H4 bulbs in the headlights plus 2x100W bulbs in spotlights that illuminated with main beam (160W on dipped beam and 400W on main beam) AFTER checking the gauge of the wires was sufficient to cope with the extra current. Illegal? - yes. Did anyone ever flash me? - no, I made sure they were properly adjusted.

 

BUT that car had simple electrics that used relays whereas on the Octavia III the headlamps are powered from the BCM, so it's a different question whether any damage will be caused (and if it is the cost of a new BCM must be a factor).

 

Would I use higher powered bulbs in my Octavia III? - absolutely not, as a retired electronics engineer I don't consider the risk worth the gain.

2 minutes ago, PetrolDave said:

 

Would I use higher powered bulbs in my Octavia III? - absolutely not, as a retired electronics engineer I don't consider the risk worth the gain.

Mine was handed back at the end of its PCP & to my shame I've gotta admit, I left the upgrade bulbs in it.

 

I'd replaced all three sets H7, H8 & H15's

About 10 years ago I had a b6 audi a4, I fitted some of the ebay special 100w H7, fitted them and tested them and left them on for about 5 mins, I could then smell burning and the headlight wiring on the back of the connector was starting to melt on both sides! ..  I let it cool down and replaced with the bulbs I took out and all was OK, since then I only fitted premium branded bulbs..  I was just so glad I tested them rather than closing the bonnet and finding out later. 

Years ago I fitted high wattage bulbs to headlights that had plastic lenses and reflectors. The reflectors' silver mirrored finish turned a nice pale golden colour thanks to the additional heat of the uprated bulbs. Prior to that I fitted 100/80W H4s to a Vauxhall Cavalier and it was fine but the headlight switch failed a few months after fitting them.