Hello there,

You will need 50-60 units of EE818PLUS for an acre of land around the arena or you can use about 25 units of EE810W-SH10 (https://www.houzz.com/products/estreet-solar-hybrid-next-generation-cree-led-smart-lights-ee800w-sh-10-watt-prvw-vr~113178754).

Thanks,

EESGI

EE800W-AI 5th Gen Solar Hybrid Microgrid LED Street Light Series, 10 Watt · More Info

[EE800W-SH Street Lights[(https://www.houzz.com/products/estreet-solar-hybrid-next-generation-cree-led-smart-lights-ee800w-sh-10-watt-prvw-vr~113178754)

Hello there,

To better understand your application and give you the suggestions. Could you please let us know the dimensions ( length and width ) of that arena? At night time, do you use the arena for walking horses or training? Could you please also provide us some pictures of that arena?

Thanks,

EESGI