Table 3. Comparison of consumed electrical power, optical power, irradiance, maximum illumination, and beam diameter across the digital colposcope systems.
| System | Illumination type | Electrical Power (W) | Optical Power (mW) | Irradiance (mW/cm2) | Maximum Illumination (ft-candle) | Beam Diameter (FWHM) (mm) |
|---|---|---|---|---|---|---|
| Leisegang Optik 2 | White LED 5000k | 18 | 79.3 | 183.9 | 2060 | 62 |
| LP Green Filter | 18 | 32.1 | 77.3 | 1112 | 62 | |
| Wallach Tristar | Halogen | 150 | 129.9 | 265.5 | 1683 | 64.2 |
| LP Green Filter | 150 | 19.9 | 40.8 | 613 | 64.2 | |
| Canon SX50HS | Halogen* | Same 150 W Halogen Source as Wallach Zoomscope | ||||
| Apple iPhone 5S Flash | White LED/Xenon | N/A | 13.2 | 24.1 | 147 | 70 |
| 2.0MP POCkeT Colposcope | White LED 5700k | 1 | 1.22 | 2.45 | 445 | 42.8 |
| 5.0MP POCkeT Colposcope | White LED 5000k | 2 | 10.7 | 23.6 | 749 | 40.2 |
| Green LEDs | 1 | 3.61 | 9.45 | 467 | 40.2 | |
Our 5.0MP POCkeT Colposcope has the flexibility to produce nearly comparable optical power (mW), irradiance (mW/cm2), and maximum illumination (ft-candle) to the commercial colposcope systems for both white and green field illumination and could produce a sufficient size FWHM beam spot of 40.2 mm to illuminate the whole cervix, generally 30–35 mm in diameter.
* For digital cervicography with the Canon SX50HS at Kilimanjaro Christian Medical Center, the 150 W halogen source from the analog Wallach Tristar colposcope was used for illumination