A $$ 21^{\circ} \mathrm{F} $$ temperature rise (above its rating) can reduce the life of a ballast by - Select one: a. $$ 50 \% $$ b. $$ 25 \% $$ c. $$ 75 \% $$ d. $$ 1 / 2 \% $$

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The lifespan of electronic components, including ballasts, is significantly affected by temperature. A commonly used rule of thumb in electronics is that for every **10°C (approximately 18°F)** increase in operating temperature, the lifespan of the component **doubles in degradation**.

In this case, a temperature rise of **21°F** is slightly above the 18°F benchmark, which aligns closely with the 10°C guideline. According to this rule:

- **A 10°C (18°F) increase** in temperature typically **reduces the lifespan by about 50%**.

Given that **21°F** is just above this threshold, the reduction in lifespan would still be approximately:

**a. 50 %**

**Answer:**  
**a. 50 %**
A $$ 21^{\circ} \mathrm{F} $$ temperature rise reduces the life of a ballast by **50 %**. **Answer:** a. $$ 50\% $$

A temperature rise (above its rating) can reduce the life of a ballast by -
Select one:
a.
b.
c.
d.

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A temperature rise (above its rating) can reduce the life of a ballast by - Select one: a. b. c. d.