I converted three 4ft T12 fluorescent lamps with these tombstones, replacing the old fluorescent tubes with 18w Hyperikon 4000K T8 LED tubes (see my 5 star review). Now the light is on at full brightness in my unheated shop and I don't have to worry about changing lamps for years.
TCP CFL Double Circle Lamp, 200W Equivalent, Bright White (3500K) T6 Circline Bulb
8 Review
Sylvania 20318 Compact Fluorescent 4 Pin Single Tube 4100K, 13-watt: Efficient Lighting Solution for Any Space
10 Review
Philips Alto PL-C Energy Saving Compact Fluorescent π‘ Light Bulb: 1800-Lumen, 3500-Kelvin, 26-Watt, 4-Pin G24-3 Base, Daylight
6 Review
π‘ Energy-Saving T2 Spiral CFL Bulb, 5000k Daylight, 23W (100W Equivalent), 1520 Lumens, E26 Medium Base, 120V, UL Listed - Pack of 8
7 Review
Lamp LED Ergolux 13638, E27, A60, 15 W, 4500 K
12 Review
Luminescent lamp Camelion 11066 ultraviolet, E27, 26 W
12 Review
Set Of 4 Geeni Prisma Wi-Fi Multicolor LED Light Bulbs, 1050 Lumens, 2700K, Dimmable, No Hub Required, Compatible With Alexa And Google Assistant, 75-Watt Equivalent
41 Review
E12 T22 Low Voltage Edison Bulb LED 12V-24V Vintage Tubular Night Light Bulb 1W 100 Lumen LED Candelabra Light Bulb 2700K 10W Equivalent Small Filament Bulb For RV,Out Door String Lights, Pack Of 25
15 Review