Thanks for the pics and words Shiney, they helped!
Yep! The ST1300's LH low beam went kaput, a little while ago, but thought it prudent to replace before Harrow RTE. Had a spare H4 (for some long sold vehicle) in a drawer in the garage, had to break-off the lower tabs, connected wiring before final fit.
Damn! Hell! Poop! No worky on high beam!!!
Will now pick a couple up through the week.
Re. wattage? I see from the thread that the general consensus is to upgrade from the OEM 45/45 to 60/55, but not any of the high wattage options of 100/75 or 100/90. I expect there is a good reason for this. Could it be that these options would generate too much heat and damage the lens or reflector, or both?
I also see from above that Biggles was thinking of going Brazillian. You crafty old devil Bill! Not sure what Mrs B had to say about that. How about a report about your batting on a clean wicket, aye?