On the jewelry glass line, annealing is where you make or break yield. Under-soaked parts hold latent thermal stress and crack later—sometimes in finishing, sometimes in the field. Over-soaking just burns gas and burns time. What you need is a heat source that hits setpoint fast, holds it even, and repeats that cycle shift after shift. What matters technically We built the jewelry glass annealing lamp around short-wave infrared quartz elements. They respond quickly and pack serious power density. It ramps from ambient to 650°C in 8 seconds, and holds the annealing belt within ±2°C across the work zone. Power density hits 35 W/cm² at the focal plane, so you’re delivering heat where it counts without cooking the surrounding fixtures. The lamp body stays below 60°C at the mounts, which keeps nearby components from scorching and keeps the operator area cleaner. Why it works for jewelry glass Jewelry glass is small, delicate, and it moves fast. You need rapid thermal response to keep pace with high-throughput furnaces and ovens, and you need uniformity to avoid differential expansion that can set off microcracks. This lamp gives you both: tighter temperature control cuts scrap, and the fast cycle shortens lead time. In practice, you get more consistent annealing, fewer rejects from hidden stress, and lower energy per piece because the heat is only on when it needs to be. Here are the practical details Installation is straightforward, but alignment is where it lives or dies. The focal distance has to match the product carrier; otherwise you’ll see hot spots and uneven annealing. The lamp runs on 230 V and needs a dedicated 16 A circuit. Expect a slight voltage drop on startup due to the high inrush current—plan your control logic around that. For long life, keep the quartz envelope clean and dry. Heavy steam or oil mist will shorten element life, plain and simple.