Lighting using 50 units of current (5)

I believe the answer is:

lamps

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'lighting using 50 units of current' is the definition.
I can't tell whether this definition defines the answer.

'50 units of current' is the wordplay.
'50' becomes 'l' (Roman numeral).
'units of current' becomes 'amps' (I've seen this before).
'l'+'amps'='LAMPS'

Can you help me to learn more?

(Other definitions for lamps that I've seen before include "light fittings" , "Lights" , "Devices for giving light" .)

I've seen this clue in The Irish Independent.

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