Labels encode just the lamp ID

Internal inventory labels: the QR carries L#### only, which keeps it
at version 1 (large modules, reliable at 23 mm) and means scanning a
label at the station types the ID and lands directly in the
re-measure flow.

label_printer.py

@@ -1,9 +1,10 @@
 """
 Lamp ID labels on the Brother QL-820NWB (DK-11221, 23x23 mm die-cut).
 
-Each label carries a QR code linking to the lamp's page on buildfor.life and
-the lamp ID as text. The station prints two per lamp: one for the box, one
-for the lamp itself.
+Each label carries the lamp ID as a QR code and as text. These are internal
+inventory labels: scanning one with the station's barcode scanner types the
+ID, which drops straight into the re-measure flow. The station prints two
+per lamp: one for the box, one for the lamp itself.
 
 Printer address comes from --printer or the HPCS_LABEL_PRINTER environment
 variable, e.g. tcp://192.168.1.50 (the QL-820NWB listens on port 9100).
@@ -24,7 +25,6 @@ from PIL import Image, ImageDraw, ImageFont
 LABEL_ID = "23x23"  # DK-11221
 DOTS = (202, 202)  # printable area of the 23x23 label
 MODEL = "QL-820NWB"
-URL_BASE = "https://buildfor.life/comparisons/lamps/"
 TEXT_HEIGHT = 52  # bottom strip for the ID text
 
 
@@ -38,15 +38,18 @@ def _font(size):
 
 
 def render_label(lamp_id: str) -> Image.Image:
-    """202x202 1-bit label: QR to the lamp page on top, ID text below."""
+    """202x202 1-bit label: the bare lamp ID as QR on top, as text below."""
     image = Image.new("1", DOTS, 1)
 
+    # Just the ID (internal use): a 5-character QR stays at version 1, so the
+    # modules print large and scan reliably at 23 mm. Scanning it at the
+    # station types the ID and lands in the re-measure flow.
     qr = qrcode.QRCode(
         error_correction=qrcode.constants.ERROR_CORRECT_M,
         box_size=1,
         border=2,  # quiet zone; tight but fine for close-range scanning
     )
-    qr.add_data(f"{URL_BASE}{lamp_id.lower()}/")
+    qr.add_data(lamp_id.upper())
     qr.make(fit=True)
     modules = len(qr.get_matrix())
     qr_size = DOTS[1] - TEXT_HEIGHT