4 Pack A19 LED Black Light Bulbs,Dimmable 9W Blacklight Bulb(100W Equivalent), E26 Base 110V, UVA Level 385-400nm, Glow in The Dark for Black Lights Party, Body Paint, Neon Glow, Art Posters

I used 2 in outlets and I switched them off then on the next day but one blew the first time using. Glad I got 4. I replaced it and haven't had trouble since. But now I'm down to 3. They make my uranium glass glow. They are strong.

We got these to take a few black light photos. We used those clamp light bases and planned to use all four. It ended up that all we needed was two. Not sure how energy efficient they are nor how long they will last because we only used them for about 30 min. We may set them up another time but if you as were we looking for something to experiment with they work perfectly.

better & brighter than expected.true UV black light.

Bought these for my teenager daughter’s birthday party. It was simple to replace our regular bulbs with these and they worked well!

Bought these for my daughter's room. They shine really bright and blacklight paint really glows. But 1 bulb burnt out after a month. I hope the others last longerUPDATE... Within 2 weeks another bulb died. Changing review to 3 stars

It appears that the bulb has multiple LEDs. I had some burned out black lights. I used these bulbs to replace the burned out bulbs and, they are much brighter than the one's I used to have. I don't know about longitivity because I just did replace the burned out bulbs. I just needed one bulb but, another old bulb burned out so the four pack was very nice.

One bulb was damaged. I was able to use the other three in the pack

They don't last long, on my last one already