I would like that all my workers like (4, 6) will have this own color of leds for example the worker 1 when he type the name of the box the place of the medicaments will led with green and the worker 2 will led with red, ect

You will have to employ only workers with perfect colour vision. Approximately 1 in 6 of the male poulation has defective colour vision. Red/green blindness is fairly common.
What advantage does having worker-assigned colours convey?

 

What the TS is asking for goes a bit beyond the normal hardware with the multi-colored lights. So really it would have a receiver with multiple LEDs for each item. And each receiver will need to be coded to react to multiple codes so that different leads can light. And still the employee will need to search for the lighted LED. So once again, how many different items? 100?, 1000, , or a whole lot more?? Thewiring would not be bad if it all was wireless with just a separate digital code for each item, followed by a digital code for each color LED to light. Just a power wire pair with connections for every receiver. Really it would be the exact opposite of RFID because each module would be flashing a light to say "here I am" when the call is given over the wireless link. So the receivers will not be standard, they will be custom, one for each item. The database will be as described before, except that instead of location coordinates each entry will have a digital code word. So the file will be large while the software will be fairly simple. Possibly the price of the receivers may be as low as $25 each. They might even be battery operated, there are very long life lithium batteries available, not cheap though. So for 1000 receivers the cost would only be $25,000 (USD). But that price does not include the receiver package or the installation. And it may be that there are far more than 1000 different items.

But you will be able to operate the pharmacy with individuals who do not even know how to read, so that will provide a cost savings.