Inert gas can be found which is inexpensive and common. For example, carbon dioxide is sometimes used in gas mixtures for GMAW because it is not reactive to the weld pool created by arc welding. But it is reactive to the arc. The more carbon dioxide that is added to the inert gas, such as argon, will increase your penetration. The amount of carbon dioxide is often determined by what kind of transfer you will be using in GMAW. The most common is spray arc transfer, and the most commonly used gas mixture for spray arc transfer is 90% argon and 10%
Phase-out of incandescent light bulbs instantly at any temperature, their extremely long lifetime is unaffected by cycling on and off, they have no glass to break, and they don't emit UV rays that fade colored materials. LED lamps radiate almost no heat, and can be either multi-directional or unidirectional, eliminating the need for a mirrored reflector in the bulb or fixture. LED lamps can emit saturated colored light. Disadvantages include spectrum limitations due to discrete emission colors, and higher up-front cost than incandescent bulbs. Botswana has an exchange program distributing CFL bulbs. Of the members of ECOWAS, Cape Verde, Guinea, Mali, Nigeria, Benin and Togo