Philips CDO / CPO Ceramic Outdoor Lamps
Philips CDO and CPO light bulbs are high pressure metal halide lamps (with exception to the CDO-TT). The very compact gas discharge lamps emit a great amount of light and are energy-efficient. The CDO lamps are exchangeable for sodium lamps (like SON) of the same wattage. These HID bulbs are predominantly used as outdoor lighting in residential areas, parks and gardens. Due to the low consumption, high light output and good color rendering, these gas discharge lamps are very suitable to light large areas. The Philips gas discharge lamps always need a ballast to be able to use them.
The colour code is a combination of the colour rendering index (CRI) and the colour temperature (K). The first number refers to the CRI (1 = very poor colour rendering, 9 = maximum accuracy). The second and third numbers refer to the colour temperature. For example, a light with a colour code of 830 has very good colour rendering and produces a warm white light. 
Philips CDO and CPO light bulbs are high pressure metal halide lamps (with exception to the CDO-TT). The very compact gas discharge lamps emit a great amount of light and are energy-efficient. The CDO lamps are exchangeable for sodium lamps (like SON) of the same wattage. These HID bulbs are predominantly used as outdoor lighting in residential areas, parks and gardens. Due to the low consumption, high light output and good color rendering, these gas discharge lamps are very suitable to light large areas. The Philips gas discharge lamps always need a ballast to be able to use them.