Custom shape bulbs are the most designer-friendly category in the HongYu catalogue. The process has two entry points: using a stock mould from HongYu's library of 15+ unique shapes (from 500 pcs, no tooling cost), or commissioning a new glass blow-mould for a completely original shape (from 5,000 pcs, tooling investment required). For stock shapes — square (SQ95), diamond (SD125), teardrop (T125), gyroscope (GS150), rocket (RT200), star (ST95), disc (DR80), barrel (B100), lantern (L125) — the economics work like a standard catalogue order: small quantities, fast turnaround, no development risk. Glass colour is applied to order (gold or smoky standard), and the light source is selected to match the design intent. This is the area interior designers and lighting brands return to most consistently, because every shape produces something genuinely unique.