Assume a 345 kV line
200 kV to ground plane
We know 95% of the energy is contained within 5% of phase spacing. Assume 30' spacing (typically 26-28 iirc).
5% ~ 1.5'
V at this point ~ (0.95)^2 x 200 kV = 180 kV
E = (200 - 180)/1.5 = 13,300 V/ft
A null point since initial point of reference.
At 3 ft 180 / (3/1.5)^2 = 45 kV
E = (180 - 45) / 1.5 = 90,000 V/ft
At 6 ft 45 / (6/3)^2 = 11.25 kV
E = (45 - 11..25)/3 = 11,250 V/ft
At 12 ft 11,250 / (12/6)^2 = 2.8 kV
E = (11.25 - 2.8) / 6 = 1,400 V/ft
At 24 ft 2800 / (24/12)^2 = 700 V
E = (2800 - 700)/12 = 175 V/ft
At 48 ft 700/(24/12)^2 = 175 V
E = (700-175)/24 = 22 V/ft
WAG, perhaps this is why the phases are ~60' AFG at the V level?
At 60 ft 175/(60/48)^2 = 112 V
E = (175 - 112)/12 = 5 V/ft
My initial assumption of 5% is high, it usually works out to 0 V at grade/ground level.
112/200,000 = 0.05%, pretty close
Is a current induced in the bulb?
Does it have a filament from + to -?
Why must it be pointed at the line?
Since B is pretty much constrained?
Or does the E field ionize or charge or excite the gas?
Does current flow thru the person?