Discussion
Consider the following statements about lighting.
1. The lux is a lumen per square metre 2. The marked lamp wattage excludes the ballast loss 3. Colour temperature and colour rendering are the same thing
Answer: D
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: a lux is one lumen per square metre, and the wattage marked on a lamp excludes the ballast loss, which is why circuit watts must be used. Statement 3 confuses two independent properties - colour temperature is how warm the light looks, and rendering is how truly it shows colours.
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