New Headlamp Bulbs

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If you are thinking of using a relay then there will be a significant improvement just with the original bulbs. You would be surprised just how much power loss you can have with just a couple of volts drop - around 10 watts per bulb (if my mental sums are correct)
 
Went with the Philips in the end; they did best in the Autoexpress test last year (H4), and (H7) in the previous test.

I still remember how much better my first twin sealed-beam headlamps (remember those?) on a 1965 Humber Sceptre were way back in 1973 compared to the ordinary glow-worm bulb headlights I'd had previously; I'm hoping these will be just as much of a revelation.
 
Went with the Philips in the end; they did best in the Autoexpress test last year (H4), and (H7) in the previous test.

I still remember how much better my first twin sealed-beam headlamps (remember those?) on a 1965 Humber Sceptre were way back in 1973 compared to the ordinary glow-worm bulb headlights I'd had previously; I'm hoping these will be just as much of a revelation.
They are until your eyes adjust . 👍
 
If you are thinking of using a relay then there will be a significant improvement just with the original bulbs. You would be surprised just how much power loss you can have with just a couple of volts drop - around 10 watts per bulb (if my mental sums are correct)

This.

It works because filament bulbs are vey sensitive to voltage variations. From the graph a 5% increase in voltage increases lumen output by 20%. The down side is an even bigger reduction in life.

This sensitivity to voltage is for the most part what is being done with all the aftermarket bulbs. They design it for a slightly lower voltage than standard so that the filament runs hotter with a whiter light output. The same shorter life rule also applies.


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This.

It works because filament bulbs are vey sensitive to voltage variations. From the graph a 5% increase in voltage increases lumen output by 20%. The down side is an even bigger reduction in life.

This sensitivity to voltage is for the most part what is being done with all the aftermarket bulbs. They design it for a slightly lower voltage than standard so that the filament runs hotter with a whiter light output. The same shorter life rule also applies.


View attachment 155390
You need to include number of carrots eaten on that graph 🤫
 

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