Hi, well I have got my set up and its looking great apart from a bit of a tight squeeze in the house. Didn't know much about them before I bought and now I am hearing a lot about bulb life. I have tried to read up on it and done a few searches on Google but cant find much. How do I find out what the expected life of my bulb is? Is there a way of checking how long its been running? (The reason I ask this is I read some where that there is a guarantee of 500 hours or 90 days. So how can they check this?) Where do I buy the Bulbs from? I have read the instruction booklet but not much info there.