Need Advice on a Light for Home and Yard Protection.....

Best budget light you can possibly get for under $50, taking 18650 batteries is the SupFire M6 that's on sale for $38.95 from Mountain Electronics. Shipping will bring it up to about $44. The looks and quality of that light are amazing.

For under $50 and taking Multiple AA batteries, would have to be the Sunwayman D40A on sale for $49.99 from banggood.com

For under $25, I would recommend the Convoy L4 on sale for $24.55 also from banggood.com

And for under $15,

I would say an Ultrafire C8 from Fasttech for $13.42 from fasttech.com

or the Solarstorm SC1, SC2, or SC03 for about $14 each with coupon code bgf164 from banggood.com