I'm getting my first projector this week and was advised to get a UPS incase of power failure so the bulb has a chance to cool down properly. Well, after looking around, I've noticed that these aren't the cheapest things to buy. My question is, would these inexpensive ones designed for computer use (like this one) suffice for a few minutes of cooling as opposed to something far more expensive like this HT-designed UPS (seen here). I know nothing about UPS systems. Please help. I'm looking for functional yet affordable.