if you want the official formular then its v=ir (where v is voltage, i is current and r is restance) and p=iv watts(p is power in watts and the others respective to previous formular) and transpose them as needed. the triangle method is extremely effective(for p=iv put the 'p' on top of the 'iv' to make a triangle then i=p over v and v = p over v)

sorry i got all techy and boring then, back to silly boy mode

and about uprating fuses, its not really advised as fuses are put there to protect cables, not devices. if you have a smaller fuse it's because the cable can't take a lot of power so just wacking a big fuse in will keep the device happy but may fry your cable

and about uprating fuses, its not really advised as fuses are put there to protect cables, not devices. if you have a smaller fuse it's because the cable can't take a lot of power so just wacking a big fuse in will keep the device happy but may fry your cable

:agree:

I would have pointed it out myself, but of course everyone knows better than a qualified spark, so why should i bother?

couldn't agree more.

so tell me luv, i trained for 4/5 years and you wash dish's, yet you still know better than me?

couldn't agree more.

so tell me luv' date=' i trained for 4/5 years and you wash dish's, yet you still know better than me?[/quote']

Ahh, sounds oh so familiar

By all means have an opinion, but never tell a qualified tradesman, engineer or any other professional he is wrong. If you dont agree, find someone else

over>

Hmm. Is that a single 15 amp fuse for the pair of headlights or one for the left and one for the right?

If it's a single 16 amp shared' date=' then @ 200W total / 12V = 16.67A

I think it won't just be the headlights that might get a little warmer than usual [/quote']

just a point

There are about 14V usualy on a properly charged battery:

200W/14V=14.2 A

But the problem may be different: is a short time while the bulb is cold then its ressitance about 0ohm (so currrent is very high) - and takes maybe longer to heat up - if the filament is thicker (i don't know - maybe is shorter) than the regular 65Wones. This cause more stress to the relays contacts - reducing their lifespan

Robert

Some guys I know used to do bike 24hr endurance racing, Bol d'Or etc and they ran aircraft landing light bulbs,from the Hella catalogue I believe, and they were BRIGHT !