The problem is that DDM is constantly changing the components used in their HID kits in order to sell cheaper and cheaper products. The ballast that they are currently selling is a DC ballast which will burn out the bulb rather quickly. It does not have any EMI filters which means that you will have radio interference and is knows to have caused power steering interference as well.
Lifetime warranty - A warranty is only good as long as the business stays in business. Furthermore, you need to figure in the costs and time involved with sending components back and forth (shipping costs) and your time in diagnosing what is actually causing the problem (sometimes a bumper removal is necessary).
I would suggest looking at our Volt HID kits.
We have set up a coupon code for this forum so that members receive a $25 discount. All they need to do is type in coupon code "LOC" upon checkout :-)
As for color temperature, what type of Lexus are you looking to install the kit in?
Steve