A:AnswerHi there,
The V630W has a better contrast ratio and can present a better image quality. The V630W is an overall better projector than the E30TB.
A:AnswerHi Katydid,
Thanks for asking. Sorry, it's recommended to project to a white wall, rather than a window.
If you want to reverse the screen, just go to Menu - projection mode and you can change the setting here.
A:AnswerYes if you can find the correct light and are willing to void your warranty and pretty mechanically inclined to take it apart yourself. But in reality no serviceable parts inside they want you to send it to them.