Dusk to Dawn Light Bulb, 5W (Equivalent to 40 Watt Incandescent) A19 LED Light Sensor Bulbs, Smart Auto On/Off, Indoor/Outdoor Lighting Bulb for Stairway Porch Patio, E27 Base, 2-Pack, Not Dimmable

• Dusk to Dawn Light Bulb: BOUBUI led dusk to dawn light bulb has a built-in photocell sensor that automatically measures daylight. At dusk, it will auto turn on (illumination＜15 LUX). At dawn, auto turn off (illumination＞30 LUX). This eliminates the need to physically turn the bulb on and off.
• Energy Saving: 5 Watt LED light bulb, 400 Lumen, warm white (3500 Kelvin), no UV radiation, no lead and mercury, can replace a 40 Watt incandescent bulb, safe and cuts your electricity costs up to 80%.
• Easy To Use: With standard E27 screw base, you just need to screw the dusk till dawn bulb into E27 lighting fixture. No wires, app or motion detector needed. Notice: to make the dusk till dawn outdoor light bulb work, you need to keep the power always on.
• Wide Application: As the bulb detects daylight only, we recomment installing on door headlight, stairway, hallway, pavement, porch, patio, garden, lawn light, pillor light. If you use it outdoors, please use it in a place or with a lighting fixture that can protect the bulbs from water. Do not use in a complete enclosed fixture, but it works well in enclosed light fixture with clear / frosted cover.
• Note: When parallel mounting, keep at least 1.3m / 3.9ft between two bulbs in case of mutual effect.

The bulbs are particularly useful for indoor/outdoor lights when you're away from your house on vacation or you are gone overnight-they automatically on/off, enhancing physical security. Type of Sensor: Photo Detector Material: Aluminum, PC Size: Diameter 60mm x Height 110mm Bulb Base: E27 Voltage: AC 220-240V Wattage: 5W Incandescent Equivalent: 40W Light Color: Cold White (6500K) Detection Angle: 220° Number of Items: 2 Note: -Consider the daylight level when it is used indoor. -Cut off power before replacing, and just leave the light switch on as the bulb will turn on/off by its own when sensor triggered. -Not application for recessed fixture as the bulb will stay on when it can't sense daylight, but for open light fixture, enclosed light fixture with clear / frosted cover. -Do not install it on any kind of dimmer / timer / sensor which will override the bulb sensor. -Not waterproofing, please use it in a place or with a lighting fixture that can protect the bulb from water.