I'm definitely a bit biased when I say you should get one from us, too, but hear me out...
A lot of the reason we started carrying these is because I was caught out several times by crap on eBay. So many of them barely qualify as fog lights, let alone actual lights you can ride by. We ended up testing four different brands (this counts only the actual bulbs that worked and doesn't include the stuff that would only be useful as a running light).
The one we carry was definitely the most expensive, but the quality is head and shoulders above all of the other offerings. This is one of those items we carry to help support the community rather than helping to support our business. After our expenses and shipping costs, we make about $5 - $8 on each of these things, and we don't sell to many because of the price. A lot of folks are not willing to pay $55 for a bulb.
That said, I highly recommend these on all your vintage bikes, but especially the Honda twins (which have anemic charging systems). These have a 20W draw, which is a huge improvement over the original 35W bulbs. Additionally, these bad boys are brighter than most 55W halogens I've seen. I've been running one on my Ducati for a year and a half with zero problems. Expected life span on these bulbs is 10,000 hours, so it's unlikely you'll ever need to buy another for one of your bikes.
The down sides is that the bulb includes a heat sink and so it's both longer and fatter than a standard bulb. If you're stashing all of your wiring in your bucket, it's going to be a very tight fit. Some folks (myself, included) use a hole saw to drill out the back of the bucket to make more room and it works just fine. Other guys have reported no fitment problems at all. Seems to be hit and miss, depending on your setup.
Pic attached of the light shining down my drive way (over 100ft) and lighting up the house across the road.
