Add ~16 RGB Zigbee smart bulbs to the components list

Compares innr RB 285 C (this project's own existing project-plan.md pick,
router-capable, confirmed zigbee2mqtt support), IKEA TRADFRI (cheapest but
not reliably on Amazon), and Sengled (cheap but not a Zigbee router, which
matters for whole-house mesh coverage) — picks innr. Count is a rough ~16
placeholder pending an actual per-room fixture count. Adds it to the
Lighting/Summed totals/Need/Price estimate sections; new subtotal
~€1,729-2,045.

docs/components.md

@@ -39,6 +39,13 @@ Components
 1xVoice Reciever - Round screen thingy
 1xSound System
 
+##Lighting
+
+~16x RGB smart bulb (exact count/room split TBD — see #Open items). Zigbee, not
+WiFi, to match this project's existing local-first Zigbee2MQTT backbone (already
+have the coordinator dongle) rather than adding a second, cloud-dependent lighting
+ecosystem. See #Need for the specific pick and why.
+
 ##Summed totals
 
 #Servers
@@ -56,6 +63,9 @@ Components
 1x Tiny PC with Mini Touchscreen (Kitchen)
 1x Camera (Kitchen)
 
+#Lighting
+~16x RGB smart bulb (Zigbee) — count/room split not finalized
+
 #By room
 Living Room:  1x ThinClient, 1x Voice Reciever, 1x Sound System (have)
 Loggia:       1x Miniscreen System (have), 1x Sound System, 1x Voice Reciever
@@ -65,6 +75,8 @@ Kitchen:      1x Tiny PC w/ Touchscreen, 1x Camera, 1x Voice Reciever, 1x Sound
 
 #Open items
 - Linus Room's "???" line is still undecided.
+- Bulb count/room split is a guess ("like 16") — not yet mapped to specific rooms
+  or fixture counts per room.
 
 #Have
 1xSound System (earmarked for Living Room)
@@ -137,6 +149,28 @@ are not:
   (see link for price) — any UVC webcam works; picked for wide availability/driver
   support, not a specific requirement
 
+#Lighting — need ~16 RGB smart bulbs (count TBD)
+**Zigbee, not WiFi/cloud bulbs** — the whole point of the Zigbee2MQTT backbone this
+project already runs (§1.3) is one local mesh instead of N different manufacturer
+clouds; a WiFi bulb (Tuya/WiZ/etc.) would be a second, cloud-dependent ecosystem
+bolted onto a stack that's explicitly local-first everywhere else. Mains-powered
+Zigbee bulbs also act as mesh **routers**, which matters here specifically: ~16 of
+them spread across every room does more for whole-house Zigbee coverage (for the
+battery sensors in §1.4) than the coordinator alone ever could.
+
+Three real options were compared, not just the first search hit:
+
+| Option | Router? | Zigbee2MQTT support | Price | Verdict |
+|---|---|---|---|---|
+| [innr RB 285 C](https://www.amazon.de/Smart-dimmbar-kompatibel-Philips-RB/dp/B07GT1LWDH) (also [2-pack](https://www.amazon.co.uk/Innr-Colour-Philips-Assistant-Required/dp/B07GT12JTJ)) | Yes | Confirmed — [zigbee2mqtt.io device page](https://zigbee.blakadder.com/Innr_RB_285_C.html) | ~€15–20/bulb (docs/project-plan.md §1.4) | **Picked** — already this project's own documented choice, real listings on multiple Amazon EU sites, RGBW + tunable white 2200–6500K |
+| IKEA TRÅDFRI color | Yes | Well-supported, huge install base | ~€12–15/bulb (cheapest of the three) | Not on Amazon in most regions (IKEA.com/stores only) — cheaper on paper but doesn't fit "find it on Amazon," and the color-capable SKU specifically (not the tunable-white-only ones) needs care to pick |
+| Sengled Zigbee color (e.g. [2-pack](https://www.amazon.com/Sengled-Changing-Dimmable-Multicolor-Equivalent/dp/B0899LJHVV)) | **No** — end device only | Supported, but community reports of RGB/XY color quirks on some zigbee2mqtt versions | Similar ballpark to innr | Skipped — buying 16 non-router bulbs throws away the mesh-strengthening benefit that's the actual reason to prefer mains-powered bulbs here |
+
+Buying at this quantity: check amazon.de for a 4-pack or larger multi-pack of the
+RB 285 C (cheaper per-unit than 16x single-packs) before ordering singles.
+
+4x-pack pricing wasn't found in search results — verify against the live listing.
+
 #Open items carried over from above
 - Linus Room's "???" line is still a completely open slot — nothing to shop for
   until it's decided what it is.
@@ -146,6 +180,8 @@ are not:
   it properly — see that host's README "Touch input: two tiers"), so this is no
   longer a go/no-go check, just worth running once to know which tier it landed in
   and whether the override needs filling in for full multi-touch.
+- Bulb count/room split — priced below at ~16, but that's a placeholder pending an
+  actual per-room fixture count.
 
 ##Price estimate
 
@@ -171,11 +207,14 @@ local pricing/VAT/shipping.
 | 16AWG speaker wire, 100ft spool *(one-time)* | 1 | €15–22 | €15–22 |
 | 10.3" portable USB-C touchscreen monitor | 1 | €85–130 | €85–130 |
 | Logitech HD Pro Webcam C920 | 1 | €55–75 | €55–75 |
+| innr RB 285 C Zigbee RGB bulb | ~16 (TBD) | €15–20 | €240–320 |
 
-**Subtotal (excludes the optional beamer mount): ~€1,489–1,700**
+**Subtotal (excludes the optional beamer mount): ~€1,729–2,020**
-**Subtotal, including the optional beamer mount: ~€1,504–1,725**
+**Subtotal, including the optional beamer mount: ~€1,744–2,045**
 
 All 5 Sound Systems (Living Room, Loggia, Linus Room, Amirs Room, Kitchen) are
 confirmed — see `#Open items` above — so all 4 needed amp+speaker kits are in the
-main table above. Linus Room's still-blank "???" line isn't priced at all — there's
+main table above. The bulb line is the least certain figure in this whole table —
-nothing to estimate until it's decided what it is.
+16 is a round-number placeholder, not a counted fixture list, so treat that
+€240–320 as the roughest estimate here. Linus Room's still-blank "???" line isn't
+priced at all — there's nothing to estimate until it's decided what it is.