Check the warranty of the replacement lamp. Many are based on days from receipt or shipment of the lamp not hours used. If this is your case then you should at least put it in and test it. Probably bet to actually use it for the length of the warranty so if it does go out you can get it replaced.
What I usually do is put the new lamp in immediately and just start using it while keeping the old lamp as a spare.
Last edited by grunt; 10/01/11 01:24 AM.