I'd think you'd probably get more candlepower riding and smoking a cigar. I'd guess that is for a bike with a larger generator or vintage tractor or car with a 6 volt system. I seem to recall my Hodie headlights are 35W/35W or so. On the flip-side, I bet it would never burn out.
FWIW, I wrote the second post more than 4 years ago and I am still using the original halogen bulb. I also purchased the Beatrice lens earlier this year for my Sleeper Ace, with great results so far.
Modifying the trim ring to accept an aftermarket lens was definitely worth it for me.
I don't ride much at night, so I've not prioritized a good headlight.
When I got the bike, both h'lite bulb filaments were burnt out. So I took the low-tech approach and did mods to install a 6v 1157 bulb. That is the brake/taillight bulb, 20w and 6w. Wimpish on high beam and barely there on low beam. It works without stressing the ancient alternator.
Alabama has a "headlight always on" law for motorcycles, and even that wimpy headlight can be considered compliant.
I plan to work on the headlight, either with Roger's plug-and-play solutions, or try to adapt a 35/35w halogen to the reflector, or adapt an LED headlight bulb conversion to the reflector. Or add external LED lights to the system.
When trying to "adapt" one style of light bulb to a reflector system made for another style entirely, you will likely never achieve what you want. Quite aside from fitment issues, which can be mastered, filament alignment generally can't be duplicated if the bulb uses a different configuration (linear versus horizontal for just one example). That would have a lot to do with why a brake light bulb throws less light than a Boy Scout flashlight. The high and low filaments must be placed at the exact focal point within the reflector that the originals were for each filament. Otherwise light is scattered, badly focused, and usually of little use.
If you use a headlight system with a replaceable bulb, stay within the same bulb family, such as H4 exchanged with H4. Don't try to mate an H7 to an H4 reflector even if you can carve alignment notches to get it to seat. It won't give good results.