Super Bright!

 The headlight on my Suzuki T500 had a 35/35W tungsten bulb that emitted about the same light as a candle and it was pretty unpleasant riding at night along unlit roads.

The generator on the Suzuki has a very limited output and it would not have been possible to upgrade to a decent 55/60W halogen like I have on the GT6 as it would flatten the battery. Also the headlamp bowl is full of wiring joints and it would be difficult to change the reflector and glass to one suitable for halogen as it would probably be too deep to fit.

Then I found that you could get a focussed LED conversion that replaces the standard tungsten bulb which on the Suzuki was a BA20D. Looks like this had already been changed from the original Suzuki Bulb holder TBH as the Suzuki bulb is a bit of a special so a previous owner had upgraded the bulb holder to the BA20D which is fitted to some classic Hondas like the 400 four.

For more modern vehicles with Halogen or Tungsten headlamps it's not road legal to just change the headlight bulb but for pre 1986 classics it is. For post 1986 vehicles the whole light unit needs to be changed to one designed for LEDs with a CE marking.

I did try a cheap Chinese manufactured focussed LED BA20D conversion from Amazon but when it arrived it was faulty and the dip was wired on main beam and vice versa so I returned it. However there was a British manufacturer of conversions for Classic Cars and Bikes, Classic Dynamo & Regulator Conversions Ltd, that had a stand at the NEC classic car and motorcycle show which I was visiting so I bought a conversion bulb from them, a bit more expensive but the quality is great and I'd certainly recommend their bulb conversions. The bulb has a focussed pattern rather than using the reflector which gets around the issues of using a reflector designed for a tungsten or Halogen bulb which would resulty in a poor bulb pattern.

BA20D focussed LED conversion kit from Classic Dynamo & Regulator Conversions Ltd

I fitted the bulb to the Suzuki today and it's very bright and takes a lot less power than even the Tugsten Bulb which is great on a bike with a low output generator.