Cisco 8841 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 8841 Specifications

General

Resolution	800 x 480 pixels
Audio	Wideband audio
Bluetooth	No
Ethernet	10/100/1000 Mbps
PoE	IEEE 802.3af compliant
Connectivity	Ethernet
Buttons	4 programmable line keys
Speakerphone	Full-duplex speakerphone
Headset Jack	Yes, RJ9
Codecs	G.711, G.722, G.729a, iLBC
Power Options	PoE
Network Interfaces	Dual Gigabit Ethernet ports
Security	Secure boot, 802.1X authentication, secure credential storage
Dimensions	40 mm
Weight	2.5 lb (1.1 kg)