Was tooling around looking for some thing else and re-found this thread. but thought this was worth revisiting. Any one try solar yard lights for MBs?
The only problem with mine was that the internal reflection is fragmented and could not find a true solar powered "spot" lite.
The other day, saw a bike with exactly what is pictured above but purpose made for bikes.
While not for MB use, I have in the past repurposed solar yard lights (sailboat, boom flood & mast light) & found they're quite handy w/a bit of tinkerin'. Often glued together w/a "no user serviceable parts inside" mentality - this simply isn't true, I'd suggest gutting one to see what you've got. Typically comprised of little more then a photoelectric sensor (can be removed/replaced with a SPST single pole, single throw on/off for this app), the photovoltaic panel, LED & usually two 1.5v cells for 3v DC (AA batteries or equivalent).
While ofc there's some variance from manufacturer & models, generally a very beneficial upgrade would be to replace the included batteries with any rechargeable NiMH cells, 2000 mAh - 2200 mAh AA type would likely be the same physical size (for fitting inside the case) yet have a possible two to three times the reserve capacity. If remote battery location is possible, rechargeable C or D cells would provide far greater reserve. A heads-up however, it's not uncommon for the stock units to have soldered connections - obv use care when applying heat to batteries to desolder if needful lol
Unfortunately with the limited wattage, there's not a lot of options for increasing lumen output to the extent of a viable headlight, but there's still quite a lot of options in better LEDs, lenses & reflectors - for this, flashlights can make excellent, low cost donors.... the only challenge the fit, this is where a dremel may be handy, or ruin everything depending heh
There's also solar "security lighting" but as they're often far larger & include motion detection, they may not be a cost effective solution compared to a DIY alternative, such as acquiring the components separately & building from scratch.
The lawn lights have the decided advantage of being cheap & plentiful -
perfect for some quality time abomineering