Panasonic LED light bulbs, 40W, 4 pieces, LDA5L-G-E17/D/S/K4 Dimmable. Purchased from Panasonic's official website, "Panasonic Store Plus," for 3850 yen each x 4, totaling 15400 yen, and used once. I bought these bulbs to convert the downlights in my living room to LED, and I changed the dimmer switch to an LED type, but it didn't work because the lighting fixtures were not LED compatible, and they flickered. To be more specific, the downlight hole diameter is 125mm, so Panasonic's E26 bulbs are required, making these unnecessary. To use these products with dimming, you need a lighting fixture with a diameter of 75mm, so please be aware of this. Panasonic LED light bulbs with the brightness of 40W, set of 4 - Brand: Panasonic - Model: Palook LED light bulb - Brightness: Equivalent to 40W - Quantity: Set of 4 Thank you for viewing.