Ushio ETC Lamp 150W 120V Halogen Bulb

The Ushio ETC 150W T4 halogen lamp is a precision replacement source for theatrical ellipsoidals, fresnels, and architectural fixtures that specify the BA15d double-contact bayonet base. Its 2900K color temperature sits in the warm tungsten register — slightly amber, continuous-spectrum output that renders with the full-bodied tonal quality that halogen sources are valued for in stage and hospitality lighting. The 2800-lumen output at 150W provides a strong luminous efficacy for this lamp class, and the 2000-hour rated average life makes replacement intervals manageable in installation contexts where lamp access requires deliberate downtime planning.

The T4 bulb type refers to the tubular envelope's diameter — a compact form factor appropriate for tight optical systems in ellipsoidal fixtures where precise lamp positioning directly affects beam quality and field uniformity. The UV-protected envelope attenuates ultraviolet radiation, a relevant safety consideration for museum, gallery, and retail lighting where prolonged occupant exposure or UV-sensitive materials require mitigation. Universal operating position means this lamp functions correctly across the full range of fixture orientations without life penalty — an important characteristic for installations where fixture tilt changes with production needs. As with all tungsten halogen sources, handle the envelope only with gloves: skin oils create localized hot spots that accelerate envelope failure and reduce effective lamp life below the rated average.