There shall be no exterior lighting of any sort
> either installed or maintained on any Lot, the light source of which
> is visible from neighboring property or streets, except as permitted
> by the Environmental Control Committee Rules. In no event shall
> fluorescent, mercury vapor, sodium, amber vapor or similar outdoor
> security lights be permitted. The Committee shall establish rules, as
> necessary or appropriate, to assure the serene, peaceful and
> rural nature of the Tahoe Donner common interest development.
KD5YI's post got me thinking... By a strict interpretation of the HOA rules, neither fireflies nor the Aurora Borealis would be permissible. Lightning either for that matter. :)