I want to brighten my henna-

I have hennaed my hair for almost two years now, and considering bleaching some areas of my hair by applying a baking soda/peroxide paste. Once I get the lighter color, perhaps in a week or two henna my whole head. I am hoping to get the brighter red from henna (as if placed on blonde hair... henna experts chime in.

Is this reasonable? How can I get brighter henna? I've used redraj & jamilla and the WOW factor isn't there... I know using henna alone won't give the WOW factor but what can? I wanna stick to the natural route.
JULY 2010 FROM STRAIGHT TO KINKY
doing my own thing... the mention of salon's make me
Jamila brand HENNA IS MY NEW LOVE!
CO, Elucene brand moisturizing shampoo/ moisturizing conditioners, AVJ/ACV rinses are in my arsenal of staple products. My hair DOES like silicones... Organix Argan Oil is a keeper.