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These clearance posts with lamps are to be mounted in a 6mm hole drilled through the baseboard at the clearance location of a set of points (turnouts).
On the NSWGR the post and lamp were painted white, paint the lens silver or leave the lens clear if you wish to light the lamp with a LED. The posts are printed in the Smooth Fine Detail Plastic (previously called Frosted Ultra Detail - FUD) material that can be made to transmit the light from a 3mm golden white LED placed into the 3mm mounting hole from below the baseboard by coating the lamp lens and the inside of the LED mounting with clear gloss lacquer or ACC Super Glue. If there is a whiteish effect on the surface then carefully scrape this away as much as possible, this is remanent printing support material. I have no control over the orientation of the print and hence the support material. Applying the clear removes the frosted look as internally the FUD is clear. If knocked hard the post may break, if so then just pull them out and replace with a new one.