Outdoor wiring. 4 cables from flicker, 3 cables in new floodlight.

[Mario42]

Hello
I will be happy if someone can help me
Cable running from house has 4 wires in it. 3 standard colors and 4th gray one. Old floodlight (on picture) was operated by sensor and by flicker inside the house. New LED one (https://www.amazon.co.uk/gp/product/B07TDNQ1N7/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1) has 3 wires cable, standard colors. How can I connect it safely? I will be using junction box. Do I just connect 3 cables color matching and secure the grey one with isolation tape? Will it still work with flicker, or just sensor?
Thanks for your help

 

[Jon c]

It looks like the old floodlight could either be operated manually by a switch or automatically by the sensor. Therefore you have a permanent live, a switched live, a neutral, and an earth in the 3core+earth cable. The new floodlight only has one live connection, so it will only switch on (automatically) when the sensor tells it to. Basically you can connect either the switched live or the permanent live to the live cable on the new floodlight, depending on whether or not you want to be able to isolate it.
I can't tell you for certain which wire is which, you would need to test this. It is not entirely clear from the picture whether black or grey is neutral, although it is clear that the brown is permanent live.

 

[Mario42]

Hi. Thanks. And how do I secure the live wire I won't be using? Is isolating tape wrapped around enough?

 

[Jon c]

You should use a connector block to terminate and secure the unused live wire.