The light projected by the device is brighter, i.e. it has a higher ANSI lumens measurement.
Panasonic PT-DZ20K: 20000cd/m²
6. lamp life
This shows the lifespan of the light source. Beamers need to have their lamps (light source) replaced every now and then.
Vivitek Qumi Q7: 30000h
7. audible noise
Audible noise is the noise that a device produces while in operation. Reduced audible noise improves quality.
Dream Vision Yunzi 1: 19dB
Celluon PicoPro: 181g
Celluon PicoPro: 147.48cm³
10. audio input ports
More audio input ports mean that more audio devices such as microphones and keyboards can be connected at once.
BenQ LW61ST: 4
11. audio output power
Audio output power is based on the number of speakers and their power in watts. High audio output power results in loud, clear sounds.
1 x 7W
Optoma EH501: 2 x 15W
12. maximum projection size
The maximum size of image that a device can project without compromising quality.
InFocus IN5544: 603"
A bigger variety of brand lenses means that you have more options and can find one that suits your needs.
Sony VPL-VW60: 11
14. contrast ratio
Contrast ratio is the visual distance between the lightest and the darkest colors that may be reproduced on the display. A high contrast ratio is desired, resulting in richer dark colors and more distinctive color gradation.