Here’s two different ways you could do it.
Using the HA get template node to retrieve the wakeup timer
[{"id":"3ee68246.155b6e","type":"api-render-template","z":"75a5ba8.f1c5d44","name":"Get wakeup timer","server":"73b62ee3.62986","template":"{{ states('input_number.wakeuptimer_house_sunrise_minute')|int * 60 }}","x":465,"y":475,"wires":[["2cd67a16.379b56"]]},{"id":"27fab26d.3c167e","type":"switch","z":"75a5ba8.f1c5d44","name":"Click Left","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":285,"y":475,"wires":[["3ee68246.155b6e"]]},{"id":"2cd67a16.379b56","type":"template","z":"75a5ba8.f1c5d44","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"{\n \"data\": {\n \"entity_id\": \"light.hue_ambiance_candle_2\",\n \"brightness_pct\": 30,\n \"transitiion\": {{payload}}\n }\n}","output":"str","x":635,"y":475,"wires":[[]]}]
or you could use a current state node to retrieve the value of sensor.wakeuptimer_…
[{"id":"2f2f77bb.dd7ff8","type":"switch","z":"75a5ba8.f1c5d44","name":"Click Left","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":185,"y":575,"wires":[["77fc7b88.116ca4"]]},{"id":"7051e4ee.a6d4ac","type":"template","z":"75a5ba8.f1c5d44","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"{\n \"data\": {\n \"entity_id\": \"light.hue_ambiance_candle_2\",\n \"brightness_pct\": 30,\n \"transitiion\": {{payload}}\n }\n}","output":"str","x":535,"y":575,"wires":[[]]},{"id":"77fc7b88.116ca4","type":"api-current-state","z":"75a5ba8.f1c5d44","name":"Get wakeup timer","server":"73b62ee3.62986","halt_if":"","override_topic":true,"override_payload":true,"entity_id":"sensor.wakeuptimer_house_sunrise_parents_duration","x":365,"y":575,"wires":[["7051e4ee.a6d4ac"]]}]