I bought these to replace the lamps in my Coleman Maxx 480 spa's top-side control. All 4 of the old bulbs had died and I couldn't read the dispay in the dark at all. These were a game-changer and worked great to restore the lights in my old panel.
INSTALL NOTE: Be VERY careful and take your time when installing these. Older panels like mine are usually brittle from the constant heat they are subjected to and they can break easily. Don't force anything and just go slow. If you think you're going to break something stop, and think about what you're doing.
I ended up removing the top-side control from my spa to replace one of the bulbs that I couldn't turn. It took a little longer but in the end it was totally worth the extra work. My 25-year-old discontinued spa panel survived and works like new again.