This prop is super simple and costs next to nothing to make. I used a 15L white plastic container left over from paint preparation.
Another source of containers is commercial cleaning companies as they get detergent in similar 20L containers.
A test with 3 high brightness green LEDs and a battery pack.
The illumination is surprisingly even.
The biohazard symbols were done with a paper stencil and black spray paint.
A small hole was drilled in the bung for the cable.
I used a 330 Ohm resistor (0.25W or better) in series with the LEDs.
A step drill can be used to drill it out to 20mm.
You can buy a set of step drill like these for less than $10 on eBay, etc.
They enlarge the hole without making a mess of the bung recess thread.
This is for connection to my 12V power system.
The pulsating effect was achieved with a $1 dimmer module off eBay.
I got a second container from a cleaning company and did the lighting a little differently.
Here’s what it looks like with the cheap LED flasher / fader running it:
The green colour is more saturated than it appears in this photo.
I also enhanced each container with some 25mm alphanumeric stencils.
The left one is yellow, top right is blue and bottom right is red.
A lot of these style containers are stackable with a 90° turn.