I've seen home theatre projectors advertised with a "lumens" unit (e.g. 2500 lumens) and large LCD panels advertised with "contrast ratio" (e.g. 80,000:1 contrast ratio.) Are thes …

Similar to the question on refresh rates, I see some mind-blowing contrast ratios quoted on TVs and projectors now. What is the minimum contrast ratio I should look for and does it …