Some options:
1. Put in a better bulb. Osram Nightbreaker or even slightly better, Philips Racing Vision. Not a huge difference, but clearly notable.
2. Fit a (double) relay to the existing system. Now there is most probably less than 12 volts at the bulb filaments, you should be able to increase this with relays. Cheap solution, relatively simple DIY job or at the workshop
.
3. Change the OE headlamp unit (Wipac or Lucas) for a Cibie 180, can be bought at Librands. Very easily done home. You will not get more light, but the light you have will be much better distributed and focused due to better optics. Aprox.140 quid if I remember well.
4. Fit a LED H4 bulb, direct replacement. Osram, Philips and many more, for instance at BetterCarLightning. Much more light, vast difference. I do not think they are road legal in UK, though - but I wonder if anyone really notice, even at MOT. H4 LEDs are not cheap but they will last a very long time.
5. Change the whole unit for a dedicated LED version, for example as the new PlusFour and PlusSix has now. Most likely the best (and probably the most costly?) solution, but personally I dislike the look when fitted to a classic car.
You can of course combine the suggestions 1-4, but if you choose to put in a H4 LED, there is not much point in adding relays. LEDs draw little current and you will have light enough. Beware of the light pattern with this, though. It might be different and diffuse than ordinary bulbs (but not nessesarily) and possibly force you to fit Cibies to avoid glare. Your choice, depending your wallet, DIY skills and driving pattern. For me, I drive mostly in bright nordic summer days and nights, so I do not need that much, although it would nice with a little more, specially in tunnels.I am at no 1 at the moment, planning for No 2. I will look at the result and maybe or maybe not move on to 3 or 4., considering how good is good enough.
