Cisco 88 Series User Manual

Answer
Lighting conditions (such as windows and ceiling lights) within the camera field of view affect the brightness.
Try moving the camera to see if the brightness improves. You can also adjust the brightness setting.
Cisco IP Phone 8811, 8841, 8845, 8851, 8851NR, 8861, and 8865 User Guide for Cisco Unified Communications Manager
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Frequently Asked Questions
Why Does the Video on my Cisco Unifed Video Camera Appear Too Dark?
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Cisco 88 Series Specifications

General

Brand	Cisco
Model	88 Series
Category	IP Phone
Language	English