Bulbits brightness? (4)

Guardian Cryptic #29270 | 2 Down | 2024-01-04
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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

not sure about this – LAMP can refer to a light bulb, and is associated with brightness, but I can’t see more than that edit: Simon S in the comments suggests L + AMP (50 amp) I think I have seen “50 amp” in wordplay before to give LAMP

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