That's good to hear, George, since the conversion I did was from original Lucas type 700 headlamp with 'duplo' bulbs directly to H4 LED, using adaptor rings, with unsatisfactory result. The carbonate fronted units on my wife's Subaru were the worst, and the PL700 front glasses reattached to modern 7' bowls on my P4 were the best. The best I managed to adjust by gluing a metal bar adjacent to the dipped beam LEDs.Ĥ) lastly, because the light source is typically separated LEDs (per side) rather than a continuous filament, the light output is patchy. Shortest life 30 secs, longest 4 years.ģ) the cut off pattern in all the knock-off units has been terrible. In fact, I read a while ago that the best visibility for comparable candlepower is achieved with approx 4000k (or matching sunlight), similar to the spectrum a tungsten filament produces.Ģ) all the LED H4 replacements I have had a shorter lifespan than a halogen bulb, with the exception of a genuine Philips Ultinon pair (yes of course they cost a lot more than the cheap Chinese knock-offs, even the ones made for the store mentioned in the prior post). There are a number of things to say about LED headlight H4 replacements.ġ) first, white does not equate to bright. Having served my time with the Rover Car Company I am in no doubt that if LED were available to them they would have been fitted instead of the sealed beam unit. Now I read in the CCW that the DVSA have notified all MOT test centres that LED lights are an immediate fail. I also contacted the DVSA at the time and spoke with one of their MOT inspectors who told me that in their opinion it would only improve the safety of the vehicle, he also said that if a MOT station required clarification point them in his direction. I contacted a supplier of the LED bulbs who ensured me at the time that they were legal and conformed with International lighting regulations. LED headlight bulbs would give me a much improved light with very little modification to the existing system. Halogen was an option but I would need to fit relays to reduce the load on the lighting circuit. I carried out a lot of research before improving my P5b lighting system. I live in a rural environment and fitting LED headlights two years ago enabled me to flow with the traffic rather than have a que of vehicles following me because I can only see a few yards ahead.

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