I made this on version 17w50a, although some other recent snapshots should work too.
Making permanently on redstone lamps:
This is done by putting a pressure plate and an item frame on top of the redstone lamp. (The item frame on the top was recently added in a snapshot) Though the tile entity of the item frame does not activate the pressure plate, it seems to keep it turned on once you step on the pressure plate.
1: Place redstone lamp
2: Place item frame on the top of lamp
3: Place pressure plate on the top of lamp -do not click on the item frame
4: Step on pressure plate
5: The lamp looks better with the new textures (although they are for 1.12): https://minecraft.net/en-us/article/try-new-minecraft-java-textures