I have no way to confirm or test.. It just says on the box.
The maker of this product call this Fluorex. It's from Lights of America.
The Fluorex fluorescent technology provides a brilliant white light that allows you to see colors and objects more clearly at night providing sharper night vision. Outdoor security fixtures that use a high pressure sodium or mercury vapor bulb produce a harsh low quality light making it difficult for the eye to focus at night. Feel safer and see better with the Fluorex bulb great for recreational and security lighting.
65 watt Fluorex bulb : 6825 lumens / 65 watts
500W Incandescent Bulb: 6500 lumens / 500 watts
It was cheap. That's why I bought it..

It also says.. on the bottom of the box..
65w Fluorescent area light, 6,500 kelvin = 6,825 photopic lumens=4,550 <- what is this?