Lamp energy comparator

For quantitative energy comparison between incandescent and LED lamps, taking into account the luminous efficacy;

Instrument set consisting of:
1 x DL723-1K Dark cup for light meter "mini
1 x DT812-LX Light meter "mini", BT
2 x DE307-9E LED lamp, 6 V, E10 (DC and AC)
2 x DE309-3T Filament light bulb, 6 V/0.5 A, E10

A lamp is operated in the dark cup and its light intensity is determined with a luxmeter.
This makes it very easy to compare the electrical energy input (watts) and the light output (lux).