Re: Aquatic Plants Digest V1 #173

Shiao Wang:  Light for algae:  SUNLIGHT!   Bring it in with mirrors if
need be.  You can get 1x4' mirrors for a couple of $ each (they are
"full length" mirrors to use in dressing).  A heliostat (that keeps
the sun constantly in view) can be made for a modest price from a
synchronous motor.  You want your mirror to revolve once per day, and
to point the sun either due north or due south and horizontal.  Then
once the mirror is adjusted, the heliostat will track the sun.   Dave

Dave Gomberg, Experimenta      San Francisco CA USA   gomberg at wcf_com