Smart LED Bulb

Material Composition Assumptions

The smart LED bulb assessment assumes a typical residential bulb weighing approximately 100 grams with the following material composition:

• Gallium nitride semiconductor components: 2g (2%)
• Aluminum heat sink and housing: 35g (35%)
• Phosphor materials including yttrium aluminum garnet: 1g (1%)
• Rare earth elements such as yttrium and cerium: 0.5g (0.5%)
• Steel and copper electrical components: 15g (15%)
• Polycarbonate diffuser and plastic housing: 25g (25%)
• Electronics including circuit board materials and LED driver: 21.5g (21.5%)

The semiconductor manufacturing process requires substantial energy input, while aluminum components contribute significantly to both weight and embodied carbon. Rare earth phosphor materials represent a small mass fraction but involve energy-intensive extraction and purification processes.

Manufacturing Geography

Smart LED bulbs are predominantly manufactured in China, which accounts for approximately 70% of global LED production capacity. Chinese manufacturing facilities benefit from established semiconductor supply chains and specialized equipment for LED chip fabrication. The electrical grid intensity of 555 gCO2/kWh significantly influences the carbon footprint of energy-intensive manufacturing processes, particularly semiconductor wafer production and aluminum smelting. Coastal manufacturing regions in China provide logistical advantages for component importation and finished product distribution to global markets.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
China	555 gCO2/kWh	38	Baseline
Germany	366 gCO2/kWh	33	-13%
United States	386 gCO2/kWh	34	-11%
India	708 gCO2/kWh	44	+16%
Norway	17 gCO2/kWh	22	-42%

Provenance Override Guidance

1. Manufacturing facility electricity consumption data with documentation of renewable energy procurement or on-site generation capacity
2. Bill of materials with specific weights and supplier information for aluminum, steel, and copper components including their recycled content percentages
3. LED chip and driver manufacturing energy consumption data from semiconductor fabrication facilities with process-specific electricity usage
4. Transportation records showing shipping methods, distances, and logistics pathways from component suppliers through final assembly to distribution centers
5. Phosphor and rare earth element processing data including extraction location, purification methods, and associated energy requirements

Methodology Notes

• The CCI score represents cradle-to-grave emissions including a 25,000-hour operational lifetime assuming average residential usage patterns
• Scope 3 dominance reflects electricity consumption during use phase, which accounts for three-quarters of total lifecycle emissions
• Functional unit covers one complete LED bulb delivering equivalent luminous output to a 60-watt incandescent bulb
• Assessment excludes end-of-life disposal scenarios due to limited recycling infrastructure data for LED components
• Manufacturing energy requirements for semiconductor production represent the largest data uncertainty, with estimates varying by 30% across different fabrication technologies