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Uploaded by Estamo, Patrick Carmel D.

EE416

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EE416 – Electrical Systems &
Illumination Engineering Design
Average Horizontak Illuminance by The
Lumen Method:
𝐸=
MIDTERM TOPIC FORMULAS
𝑁𝐿 × πΏ × πΏπ‘ˆ × πΆπ‘ˆ × πΏπΏπΉ
π΄π‘Ÿπ‘’π‘Ž
Luminous Intensity:
𝑐𝑑(𝑐𝑝) = 𝐼 = π‘π‘Žπ‘›π‘‘π‘’π‘™π‘Ž
Pythagorean Theorem:
Luminous Flux:
1π‘š2 (𝑓𝑑 2 ) π‘œπ‘“ π‘ π‘’π‘Ÿπ‘“π‘Žπ‘π‘’ π‘œπ‘› π‘‘β„Žπ‘’ π‘ π‘β„Žπ‘’π‘Ÿπ‘’
𝑖𝑠 1π‘™π‘š(π‘™π‘’π‘šπ‘’π‘›)
1𝑐𝑑 = 4πœ‹ = 12.57π‘™π‘š
Trigonometric Ratios of Right Triangle
𝑆𝑂𝐻 → 𝑠𝑖𝑛 =
π‘‚π‘π‘π‘œπ‘ π‘–π‘‘π‘’
π»π‘¦π‘π‘œπ‘‘π‘’π‘›π‘’π‘ π‘’
𝐢𝐴𝐻 → π‘π‘œπ‘  =
π΄π‘‘π‘—π‘Žπ‘π‘’π‘›π‘‘
π»π‘¦π‘π‘œπ‘‘π‘’π‘›π‘’π‘ π‘’
𝑇𝑂𝐴 → π‘‘π‘Žπ‘› =
𝑙𝑒π‘₯ =
π‘™π‘’π‘šπ‘’π‘›π‘ 
π‘ π‘žπ‘’π‘Žπ‘Ÿπ‘’ π‘šπ‘’π‘‘π‘’π‘Ÿ π‘Žπ‘Ÿπ‘’π‘Ž
or
𝑙π‘₯ =
π‘™π‘š
π‘š2
and
π‘“π‘œπ‘œπ‘‘π‘π‘Žπ‘›π‘‘π‘™π‘’π‘  =
π‘™π‘’π‘šπ‘’π‘›π‘ 
π‘ π‘žπ‘’π‘Žπ‘Ÿπ‘’ π‘“π‘œπ‘œπ‘‘ π‘Žπ‘Ÿπ‘’π‘Ž
or
𝑓𝑐 =
π‘™π‘š
𝑓𝑑 2
where,
10.764 𝑙𝑒π‘₯ = 1𝑓𝑐
π‘‚π‘π‘π‘œπ‘ π‘–π‘‘π‘’
π΄π‘‘π‘—π‘Žπ‘π‘’π‘›π‘‘
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