The description of different chips are as follows:
HQ:
Resolution: 520TVL
PAL: 752 x 582 pixels
NTSC: 768 x 494 pixels
Current: 500mA
Illumination of 0.4 Lux/1.2.
STH:
Image sensor: 1/3-inch Sony
Resolution: 480TVL
PAL: 752 x 582 pixels
NTSC: 768 x 494 pixels
Current: 500mA
Illumination of 0.5 Lux/1.2
STL:
Image sensor: 1/3-inch Sony
Resolution: 420TVL
PAL: 500 x 582 pixels
NTSC: 510 x 492 pixels
Current: 450mA
Illumination of 0.8 Lux/1.2
SFL:
Image sensor: 1/4-inch Sony
Resolution: 420TVL
PAL: 500 x 582 pixels
NTSC: 510 x 492 pixels
Current: 450mA
Illumination of 0.8 Lux/1.2
PTL:
Image sensor: 1/3-inch Sharp
Resolution: 420TVL
PAL: 500 x 582 pixels
NTSC: 510 x 492 pixels
Current: 400mA
Illumination of 1.0 Lux/1.2
PFL:
Image sensor: 1/4-inch Sharp
Resolution: 420TVL
PAL: 500 x 582 pixels
NTSC: 510 x 492 pixels
Current: 400mA
Illumination of 1.0 Lux/1.2
AGC: on/off
Gamma characteristic: above 0.45
White balance: automatic
Backlight compensation: on/off
S/N ratio: greater than 48dB
Power supply: 12V DC
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