---
product_id: 404523311
title: "(BT31P4) Photocell day night sensor for street light garden light (Rating IP44)"
brand: "blackt electrotech"
price: "¥4385"
currency: JPY
in_stock: true
reviews_count: 5
category: "Blackt Electrotech"
url: https://www.desertcart.jp/products/404523311-bt31p4-photocell-day-night-sensor-for-street-light-garden-light
store_origin: JP
region: Japan
---

# AC 220-250V wide voltage range 5-15 lux precise ambient light detection IP44 waterproof rating for outdoor durability (BT31P4) Photocell day night sensor for street light garden light (Rating IP44)

**Brand:** blackt electrotech
**Price:** ¥4385
**Availability:** ✅ In Stock

## Summary

> 🌗 Light-smart living made effortless—never be left in the dark again!

## Quick Answers

- **What is this?** (BT31P4) Photocell day night sensor for street light garden light (Rating IP44) by blackt electrotech
- **How much does it cost?** ¥4385 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/404523311-bt31p4-photocell-day-night-sensor-for-street-light-garden-light)

## Best For

- blackt electrotech enthusiasts

## Why This Product

- Trusted blackt electrotech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Automation:** Automatically switches your outdoor lights on/off based on natural light—never worry about manual control again.
- • **Precision Light Sensing:** Activates lights only when ambient light dips below 5-15 lux, optimizing energy use and extending bulb life.
- • **Plug & Play Installation:** Compact, wall-mountable design with push-button control—easy to install and forget, perfect for busy professionals.
- • **Weatherproof Reliability:** IP44-rated waterproof design guarantees consistent operation in rain, humidity, and outdoor conditions.
- • **Robust Voltage Compatibility:** Operates seamlessly within a broad 220-250V range, ensuring stable performance with standard power supplies.

## Overview

The Blackt Electrotech BT31P4 is a high-performance photocell day-night sensor designed for outdoor lighting control. Featuring a wide operating voltage range (AC 220-250V), precise ambient light detection (5-15 lux), and an IP44 waterproof rating, it ensures reliable, energy-efficient automatic switching of street and garden lights. Its compact, wall-mountable design with push-button control offers hassle-free installation and long-lasting durability, making it an ideal choice for modern outdoor lighting management.

## Description

Specifications Operating volt: AC 220-250v 50hz-60hz. Rated current:6 amp Ambient light: <5-15 lux Working temp: -20~+40 degc Working humidity: <93% rh Rating : IP65

Review: Reliable - Very good and long life product. I purchased it second time.
Review: Tension free. - Just connect it and forget it, no tension to on off everyday. Amazing product. I have using 3 for 5 different lights.

## Features

- Reliable day-night sensor: The Blackt Electrotech BT31P4 features a high-quality photocell day-night sensor, ensuring automatic activation and deactivation of street lights and garden lights based on ambient lighting conditions.
- Wide operating voltage range: With an operating voltage range of AC 220-250v and a frequency of 50hz-60hz, the Blackt Electrotech BT31P4 is compatible with standard power supplies, providing reliable and consistent performance.
- Optimal ambient light detection: The BT31P4 is designed to detect ambient light levels between 5-15 lux, ensuring accurate activation and deactivation of lights based on the surrounding lighting conditions.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01KMAQLB4 |
| Best Sellers Rank | #173,497 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,458 in Electrical Wall Switches |
| Brand | Blackt Electrotech |
| Brand Name | Blackt Electrotech |
| Bulb Base | E27 |
| Color | Gray |
| Colour | Gray |
| Connectivity Protocol | Wi-Fi |
| Controller Type | Push Button |
| Customer Reviews | 4.1 out of 5 stars 3,071 Reviews |
| Finish Types | Polished |
| Fixture Type | Outdoor Lighting Fixture |
| Included Components | Screw |
| Indoor Outdoor Usage | Outdoor |
| Installation Type | Wall Mount |
| Item Dimensions L x W x H | 40L x 40W x 50H millimeters |
| Item Type Name | Day night Sensor |
| Item Weight | 65 Grams |
| Light Color | white |
| Light Fixture Form | Path |
| Light Source | LED |
| Light fixture form | Path |
| Lighting Method | Incandescent or Fluorescent |
| Manufacturer | Blackt Electrotech |
| Manufacturer Part Number | BT31P14 |
| Material | Acrylonitrile Butadiene Styrene |
| Material Type | Acrylonitrile Butadiene Styrene |
| Model Number | BT31P4 |
| Mounting Type | Wall Mount |
| Number of Items | 1 |
| Other Special Features of the Product | Waterproof |
| Power Source | AC |
| Recommended Uses For Product | Outdoor lighting control, Energy management |
| Required Assembly | No |
| Room Type | Entryway |
| Room type | Entryway |
| Shade Material | Acrylonitrile Butadiene Styrene |
| Shape | Rectangular |
| Size | 3 x 3 |
| Smart Home Compatibility | Not Smart Home Compatible |
| Specific Uses For Product | general purpose |
| Specification Met | CE |
| Style Name | Rating IP44 |
| Switch Type | Push Button |
| Unit Count | 1 Count |
| Voltage | 230 Volts (AC) |
| Water Resistance Level | Waterproof |
| Wattage | 250 watts |

## Product Details

- **Brand:** Blackt Electrotech
- **Colour:** Gray
- **Power source:** AC
- **Item weight:** 65 Grams
- **Mounting type:** Wall Mount

## Images

![(BT31P4) Photocell day night sensor for street light garden light (Rating IP44) - Image 1](https://m.media-amazon.com/images/I/711fQ2ohUoL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Reliable
*by X***T on 11 January 2026*

Very good and long life product. I purchased it second time.

### ⭐⭐⭐⭐ Tension free.
*by P***L on 21 July 2024*

Just connect it and forget it, no tension to on off everyday. Amazing product. I have using 3 for 5 different lights.

### ⭐⭐⭐⭐⭐ Installed at a Handy Outdoor Location under Roof
*by V***H on 5 May 2024*

Bought it in March 2024 for about ₹275. Works fine with 50W load - no problems so far: switches the load ON at dusk and switches OFF at dawn. Looks Durable. Hence the 5-star rating. 🪛 I have installed it at a handy outdoor location under the roof, instead of at a vertical height of outdoor light. It makes this Photocell easily serviceable/replaceable, not needing a ladder to reach at the top of the pole light. ☂️ Keeping it under the roof should extend its life as there's no rain and minimum direct sunlight to deteriorate its plastic casing. 🌞 Also it is a well known fact that electronic components give up sooner when under the UV rays of Sun for prolonged time. 🗓️⏳ Since the daylight-detection and load (light-bulb) controlling circuitry runs 24x7, I would be satisfied if this Photocell lasts for 3-years, and would be delighted if lasts for more than 5-years.

## Frequently Bought Together

- Blackt Electrotech (BT31P4) Photocell day night sensor for street light garden light (Rating IP44)
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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-08-13*