The best way to determine the requirements of the project is to:
1.Determine the geographic location of the light pole and fixture
2.Determine to total weight and EPA of the pole and fixture (Check the Spec Sheets for EPA values)
3.Determine the wind load requirement (see map below)
4. Check with the pole manufacturer to ensure the pole can support the weight of the fixture and hold up to the wind load
If additional engineering calculations are required you should contact a local Engineering firm. These typically are not extremely expensive and some range from $500 - $1000 for signed and sealed calculations.