The best lights to use in the Detolfs are the "Dioder Four Pack".
There are four lights per pack. I use one pack per Detolf with great effect.
These are ultra thin, and emit very little heat. You can easily hold the palm of your hand against them for hours
They are so light, that mine are only affixed with the supplied double-sided tape. The light is also more natural and bring out more details of the figures.
Here is the link to them on the IKEA Australia website for more info:
https://www.ikea.com/au/en/catalog/products/80119934
You will need to check with your IKEA for your local pricing.
Cheers