Calculation Method

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$$\begin{aligned} \text{HLReference} = & \frac{\text{A}_\text{skylight + ARoof}}{6.6} + \frac{0.7 \times \text{total wall area}}{2.0} \\ & + \frac{\text{A}_\text{slab-on-ground floor}}{1.5} + \frac{\text{A}_\text{other floor}}{2.5} + \frac{0.3 \times \text{total wall area}}{0.46} \\ \end{aligned}$$