Infrared range in an 8-channel relay module - what is the maximum?

I'm about to buy an 8 channel infrared controlled relay module and I'm worried about the range, just by eye what would be the maximum range of such a signal?

Depends on the design (transmit diode, receive diode, filter quality, ...), high brightness (sun) can reduce range. Usually 4-6m is no problem. I don't know how for longer distances.
And it is mandatory that the transmitter and receiver can see each other.

MARCIN.SLASK wrote:

Well, and obligatorily the transmitter and receiver must see each other.

It doesn't have to. I once did experiments and controlled a TV by pointing the remote control diode at a wall (i.e. a reflection of the signal). With a white, smooth wall it worked. Same with controlling the dimmer in the room, I would run it from the hallway. The condition was one - new batteries.
The conclusions from these games seem clear. The signal of the transmitter must be of sufficient power so that this minimum going to the receiver is large enough to excite it. The greater the power of the transmitter, the greater the deviation from 'seeing itself' can be.

retrofood wrote:

MARCIN.SLASK wrote:

Well, and obligatorily the transmitter and receiver must see each other.

It doesn't have to. I once did experiments and controlled a TV by pointing the remote control diode at a wall (i.e. a reflection of the signal). With a white, smooth wall it worked. Same with controlling the dimmer in the room, I would run it from the hallway. The condition was one - new batteries.
The conclusions from these games seem clear. The signal of the transmitter must be of sufficient power so that this minimum going to the receiver is large enough to excite it. The greater the power of the transmitter, the greater the deviation from 'seeing itself' can be.

Yes, but through a wall or door it will not pass through (through a piece of paper it does). Therefore, it can be through a reflection (I do not necessarily point the remote control to the TV myself), but the rays must reach.