Bulb Listings from Amazon that I found while working on Pau Hana...

These are all for 24volt (anything that I tried that was a range-voltage, ie 12-36V, usually failed spectacularly). The last 2 are for indicator lights on power panels, etc.

Amazon.com: CEC Industries B2A Ne 51H Neon Glow Lamp : Tools & Home Improvement

4 x E26/E27 24V DC LED Light Bulbs - Warm White - Amazon.com

10 Watt T3.25 Xelogen, Festoon Base, Clear - Amazon.com

BesYouSel G4 10W Halogen Bulb G4 AC/DC 24V 10W Halogen JC T3 24V G4 Bi-Pin Base 10W Halogen Light Bulb Precision Halogen Light Bulbs for Home Lighting Pendant Light 2700K Warm White, Clear, 10 Pack - Amazon.com

CEC Industries #757 Bulbs, 28 V, 2.24 W, BA9s Base, T-3.25 shape (Box of 10) - Amazon.com

Amazon.com: CEC Industries B2A Ne 51H Neon Glow Lamp : Tools & Home Improvement