Duckling heat lamp?

[ducklings5405]

I have a 100W heat lamp for ducklings, how high up should I position it when they first hatch? online it says 12-15 inches but I don't know if that applies to my lamp strength.

 

[oldhenlikesdogs]

You will need to use a thermometer to set the initial height. Lay it down directly under the light. After a bit you can begin trying to adjust it until you get the temperature you want.