I have to admit I got it working once but had issues with the outputs. So I played around further and screwed it from there. So I can confirm it’s possible but the how… 
that much about the opening words. Now my current setup (not working)
Items:
Dimmer kitchen_led2__All “2-Helligkeit [%d %%]” {zwave=“7”}
Dimmer kitchen_led2_R “2-Rot [%d %%]” {zwave=“7:2:command=switch_multilevel”}
Dimmer kitchen_led2_G “2-Green [%d %%]” {zwave=“7:3:command=switch_multilevel”}
Dimmer kitchen_led2_B “2-Blau [%d %%]” {zwave=“7:4:command=switch_multilevel”}
Dimmer Kitchen_led2_in1 “LED input 1 [%d]” {zwave=“7:5:command=sensor_multilevel,respond_to_basic=true”}
Dimmer test_led_0 “LED CHannel 0 [%d %%]” {zwave=“7:command=switch_multilevel”}
Dimmer test_led_1 “LED CHannel 1 [%d %%]” {zwave=“7:1:command=switch_multilevel”}
Dimmer test_led_2 “LED CHannel 2-red [%d %%]” {zwave=“7:2:command=switch_multilevel”}
Dimmer test_led_3 “LED CHannel 3-green [%d %%]” {zwave=“7:3:command=switch_multilevel”}
Dimmer test_led_4 “LED CHannel 4-blue [%d %%]” {zwave=“7:4:command=switch_multilevel”}
Dimmer test_led_5 “LED CHannel 5 [%d %%]” {zwave=“7:5:command=switch_multilevel”}
Number test_led_in1 “led in1 [%d]” {zwave=“7:1:command=BASIC,respond_to_basic=true,refresh_interval=60”}
Number test_led_in2 “led in2 [%d]” {zwave=“7:2:command=BASIC,respond_to_basic=true,refresh_interval=60”}
Number test_led_in3 “led in3 [%d]” {zwave=“7:3:command=BASIC,respond_to_basic=true,refresh_interval=60”}
Number test_led_in4 “led in4 [%d]” {zwave=“7:4:command=BASIC,respond_to_basic=true,refresh_interval=60”}
Number test_led_in5 “led in5 [%d]” {zwave=“7:5:command=BASIC,respond_to_basic=true,refresh_interval=60”}
Yes some are doubled as I use different styles on different sitemaps. I tried to comment out/delete some to see if that’s the issue but doesn’t seem so.
for the sitemap:
Default sitemap
sitemap default label="Main Menu"
{
Frame label="LED" {
Slider item=Kitchen_led2_in1
}
Frame label="LED2" {
Slider item=kitchen_led2_R
Slider item=kitchen_led2_G
Slider item=kitchen_led2_B
}
}
(other rooms and some non related definitions removed (to keep it simple) )
and sitemap for investigation/troubleshooting of this input
sitemap testing label="testing items"
{
Slider item=test_led_0
Text item=test_led_1
Slider item=test_led_2
Slider item=test_led_3
Slider item=test_led_4
Text item=test_led_5
Text item=test_led_in1
Text item=test_led_in2
Text item=test_led_in3
Text item=test_led_in4
Text item=test_led_in5
}
I’m running it of a RPI with ZWAY Server daughter card. Therefore I use habmin to configure the items. I did this with the other rgb strip as well and seem to work better than with z-way-server.
Zwave binding is 1.8.2
so far above it’s not working. I’ll now try above approaches and see if it’s helps.