Eco Haloline Halogen Tube, R7s Base, T3 Halogen Bulb, 230v, 230w300w, 118 Mm, Warm White - 2800k (5 pieces) Average lifespan in hours: 2000 Energy consumption in kWh / 1000h: 230=300W Lumens: 4650 Watts: 230=300W 90-day manufacturer's warranty Instructions for buying the right light bulbs: Base, shape and dimensions Base: R7 with double-ended 0.38 inch diameter. Shape: T3 type J118. Diameter: 9.5 mm. Length: 118 mm. Make sure the light source's double base fits your lamp. Check if your lamp's length is 118 mm. As there is a shorter 78 mm (3.13 inch) version which can be seen in the pictures. Check these specifications before ordering. Light properties Power: 230W=300W. Luminous flux: 4650 lumens. Voltage: 220V, 230V, 240V AC. Beam angle: 360. Material: glass. Color rendering index (CRI): 100 for vivid and enhanced colors. Instant on. No mercury. Lifespan: 2000 hours (1.8 years with average use of 3 hours per day). CE and RoHS certified. Set of 5 pieces. Use of halogen dimmers These halogen lamps can be dimmed if equipped with a dimmer. Suitable for incandescent and halogen lamps All incandescent or halogen lamps can be dimmed with conventional dimmers, as these dimmers simply adjust the voltage level for dimming. Dimming with LED dimmers only leads to incompatibility, as LED dimmers work very differently. Check your dimmer or lamp's compatibility before purchasing.