Cisco 8845 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 8845 Specifications

General

Camera	No
Audio	Wideband audio
Speakerphone	Yes
Wi-Fi	No
Display	5-inch color display
Resolution	480 x 272 pixels
Ethernet	10/100/1000 Mbps
PoE	IEEE 802.3af/at
Protocols	SIP
Codecs	G.711, G.722, G.729a, iLBC
USB Ports	2 x USB 2.0