The higher the number the brighter the Lumes are. The 1500 would be a better choice for you in this case. But you aslo need to see what the pixels per frame are and what type of input it will accept...;)

Generally the higher the "lumens" the brighter the projector is- which means it will work better in more lit up rooms. However, to prolong bulb life, turn down the brightness setting on the projector whenever possible, and make sure that the projector is well ventilated. Look at how long the bulb lasts because the bulbs are expensive- like between $100 and $400 (yes, for the bulb!!!! god knows why those are SOOO expensive!) You'll most likely have to replace it once a year depending on the projector, and how often you use it. Keep in mind, however, that they normally dont just suddenly "blow" like normal bulbs do- they dim gradually, and I believe that the projector somehow detects that it's not as bright as it used to be, because most of them these days have a "bulb life warning" light on the projector itself, or say "Please replace the LAMP" on the screen, because sometimes people fail to notice that it's dimmer than it used to be because it dims S L O W L Y near the end of it's life. This gives you time to track down the right bulb so you have a replacement on hand when it does burn out- and don't worry, there is a specific model # written in the instruction book so you won't have any doubt of whether the bulb you bought will work with your projector.