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SV650rules · 22-05-19, 10:43 AM

I would definitely use relays if I was fitting higher wattage bulbs, a 10% drop in voltage to a filament bulb reduces output by about 20%, so maybe using relays with standard bulbs is worth it. Car makers use relays to switch headlight power as a matter of course and their electrical system has higher capacity than a bikes and a twin headlight bike draws just as much current as a cars headlights when H4 filament bulbs used.

IMHO £70 from classiccarleds for a pair of Philips Luxeon ZES chipped bulbs is a steal if you look at prices of other bulbs with same chips ( 2x or 4x the price), as I said we have been using these LED bulbs for pretty much 2 years now and no failures and headlights are chalk and cheese with best filament bulbs we could find - and I can assure you they have passed MOT even with the new rules on aftermarket bulbs and beam pattern that came in in 2016 and updated again in 2018.

https://mattersoftesting.blog.gov.uk...t-is-changing/

22-05-19, 10:43 AM	#43
SV650rules Member Mega Poster Join Date: Nov 2016 Location: Shropshire UK Posts: 1,363	Re: Osram Night Breaker Laser H4 I would definitely use relays if I was fitting higher wattage bulbs, a 10% drop in voltage to a filament bulb reduces output by about 20%, so maybe using relays with standard bulbs is worth it. Car makers use relays to switch headlight power as a matter of course and their electrical system has higher capacity than a bikes and a twin headlight bike draws just as much current as a cars headlights when H4 filament bulbs used. IMHO £70 from classiccarleds for a pair of Philips Luxeon ZES chipped bulbs is a steal if you look at prices of other bulbs with same chips ( 2x or 4x the price), as I said we have been using these LED bulbs for pretty much 2 years now and no failures and headlights are chalk and cheese with best filament bulbs we could find - and I can assure you they have passed MOT even with the new rules on aftermarket bulbs and beam pattern that came in in 2016 and updated again in 2018. https://mattersoftesting.blog.gov.uk...t-is-changing/ __________________ 2016 SV650 AL7 Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain Last edited by SV650rules; 22-05-19 at 10:55 AM.