All Bulbs Are Tested Before Shipment, Excellent Return Service With No Any Condition Within 12 Hours Feedback. INSTALLATION AND SAFTY: You will find it is quite easy to install it into your Projector as the ways you are taking out your old lamp. Be aware of the connector make sure it connected well. It is not electric, shut down your Projector when you install it. Compatibility：Sometimes you may encounter a situation where the new bulb you bought does not work.This is usually caused by inaccurate matching of production parameters . However, our engineers solved this problem by continuously collecting big data and testing. Optimized Burner Design Allows any Burn-in Position, Moreover, They Show a Very Stable Light Output, as The High Luminance Decreases Only Slightly Over The Entire Lifetime(between 2500 and 4500 h). Respected customers, please confirm whether this product is your product before placing the order, so as to avoid mistakes and delay your time.