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University of Idaho Integrated Design Lab 

HELIOS · IECC 2018 · Section C405 · Idaho-adopted · New construction 

Commercial Lighting Compliance Workflow

HELIOS — High-Efficiency Lighting & IECC Optimization System. A guided sequence of design-phase tools — from establishing the lighting power allowance through daylight zones, the fenestration envelope, and the final interior and exterior compliance checks. Work through them in order.

Phase 01 — Early Design
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IECC 2018 · Section C405 · New construction

Design-Phase Lighting Advisor

Establish the interior lighting power allowance from code at the earliest stage — before contracting with manufacturers. Sets the budget envelope to design against.

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Phase 02 — Daylight & Envelope
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C405.2.3 · Sidelit + Toplit Zones

Daylight Area Calculator

Compute the sidelit (C405.2.3.2) and toplit (C405.2.3.3) daylight zone areas — adjacent to vertical fenestration and beneath skylights and roof monitors — to identify the spaces requiring daylight-responsive controls.

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C402.4 · Fenestration (Prescriptive)

C402.4 Fenestration Compliance

Verify fenestration area and SHGC against the prescriptive envelope requirements before finalizing the lighting compliance path.

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Phase 03 — Compliance
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IECC 2018 · Section C405.3 + C405.2

Interior Lighting Compliance

The final check — interior lighting power allowance and required lighting controls under C405.3 and C405.2, confirming the design lands within code.

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IECC 2018 · Section C405.4

Exterior Lighting Compliance

Check exterior lighting power allowances and required controls under C405.4 — façades, entrances, parking, and grounds — against the code limits to close out the design.

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