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Material for Cfl Bulb

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Submitted By ralphlagdameo
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Part 2 Individual Project Report: Lights

Introduction
There are many types of sources of light in the world. Amongst the most commonly used would be the light bulb. Furthermore, as Prof. Seeram thought of the project by looking at items found in everyday usage, I would assume that the light source in question would be the compact fluorescent light (CFL) bulb. It consists of glass vacuum tubing coated inside with luminophore; this tube contains mercury and argon with an electrode on each end, which is coated in an emission material (Mishra) (Acton). There is also ballast, ballast housing and its base but we will be focusing on the vacuum tube, electrode and ballast housing in this project.

Fig 1. Inner workings of CFL bulb

Types of material used
Looking at the vacuum tube electrode and ballast housing, Table 1 below shows the materials used for each component (Hengdian Group Tospo Lighting Co.,Ltd.).

Table 1. Materials used in a CFL bulb

Material used in a CFL bulb | Component | Material | Vacuum tube | Soda lime glass | Electrodes | Tungsten covered in (BaO, CaO, SrO) + ZrO2 | Ballast Housing | PBT (Polybutylene-terephthalate) or PET (Polyethylene- terephthalate) |

Critical material properties and testing standards for components
Table 2 below shows the critical material properties for the components used as well as the general standards used in the United States of America for testing if any.

Table 2. Critical material properties and testing standards

Critical material properties and standards used in a CFL bulb | Component | Critical material properites | Testing standards | Vacuum tube | StrengthOpacityMelting pointInertness/Leakage | ANSI C78.5-2003170 FR 604072IESNA LM-62-063ANSI C78.5-20031 | Electrodes with emissive coating | Electrical conductivity (energy used)Melting pointHigh service life | Code of Federal

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