If I did the math correctly, this is what you get
from the 3 ansi designations for lights.
| |
beam spread (degrees) |
tan(beam spread) |
beam width at 100' (feet) |
beam width at 200' (feet) |
beam width at 300' (feet) |
beam width at 500' (feet) |
| ideal taxi? |
30 |
0.577 |
58 |
115 |
173 |
289 |
| ideal landing? |
10 |
0.176 |
18 |
35 |
53 |
88 |
| eyf |
12 |
0.213 |
21 |
43 |
64 |
106 |
| eyj |
25 |
0.466 |
47 |
93 |
140 |
233 |
| eyc |
40 |
0.839 |
84 |
168 |
252 |
420 |
fix your own spreadsheet
attached