These bulbs are the No. R39 at this manufacturer and are small pellets. Since I've mostly as large caps, I purchased an adapter to 3.39 in hardware stores but since I found half the price on Amazon. There are 5 different types of dials and lights from this manufacturer, but a single reference to large cap (R63) This first trial is successful, they immediately provide light equivalent to my "Diesel" 25w bulbs that need to be heated before giving their full power. It is a white light that provides good visibility but without being aggressive. These bulbs are LED, so they are energy efficient but difficult to verify unless you equip the entire house. Their bi-material and bi-color design makes them original and the model C37 peak should surely better in my ceiling fan.
