diff --git a/weltenbaulab/index.html b/weltenbaulab/index.html
index cf10097..0c223a6 100644
--- a/weltenbaulab/index.html
+++ b/weltenbaulab/index.html
@@ -109,8 +109,8 @@
         <cbase-linechart timeseries="clima.humidity.weltenbaulab clima.humidity.soundlab" width="34" height="40"></cbase-linechart>
       </section>
       <section id="lab-history">
-        <h2>c-lab (last 9d)</h2>
-        <cbase-polar timeseries="clima.light.c_lab" days="9" size="40" percentage></cbase-polar>
+        <h2>c-lab (last 7d)</h2>
+        <cbase-polar timeseries="clima.light.c_lab" days="7" size="40" percentage></cbase-polar>
       </section>
     </main>
     <h1 id="screen-title">c-base weltenbaulab</h1>