Why does my dust to dawn Security light not come on until 5 hr after dark?

If your dusk-to-dawn security light doesn't turn on until several hours after dark, it may be due to a faulty photocell sensor that is not detecting low light levels accurately. Additionally, the light could be set to a delayed start feature, or there might be an issue with the electrical connection or wiring. Check for any obstructions that could be affecting the sensor and ensure that the bulb is functioning properly. If the problem persists, consider replacing the photocell or consulting a professional electrician.