Yellow or greeny colour instead of brite white

[leedsfan]

Dear all,
I have signed up here hoping you can help me, I run a busness on ebay selling sunglasses, I have taken digital images for a while using s Finepix 40i ( i know its quite old now).
I have recently bought a light tent and use 2 * 23w flouresent coiled lights on either side of the light tent , i have taken various shots adjusting the EV from 0.3 to 1.5 (only available in increments of 0.3)(0.6, 0.9, 1.2 etc) and adjusting the white balance on all the settings, HOWEVER i seem to be only getting a yellow background (pls see pics)

http://homepage.ntlworld.com/j.levey/sunnys%20(1).jpg

http://homepage.ntlworld.com/j.levey/sunnys.jpg

and nothing like a brilliant white image as per all the light5 cube websites
I am sorry if this is a stupid question, but i'd really love some help here, is it the lights i'm using they look ok to me, i'm hoping my camerea is faulty, asi simply cant get anything like a white background (only yellow or green) , DO YOU THINK its could be my camereas the lights or simply is it me , not destined to be a photograper