28:15a the weight of the gold lampstands and their lamps,

⌊He/David told him/Solomon⌋ the weight required for the gold lampstands and the lamps that were/went on them.
-or-

⌊He told him⌋ how much gold they should use for the lamps and lamp holders

28:15b including the weight of each lampstand and its lamps;

⌊He also told him the total⌋ weight required for the lampstands and the lamps on them.
-or-
and how heavy they should be.

28:15c the weight of each silver lampstand and its lamps,

⌊He told him⌋ the weight required for the silver lampstands and the lamps on them.
-or-

⌊He told him⌋ how much silver they should use for the lamps and lamp holders.

28:15d according to the use of each lampstand;

⌊Their weight⌋ depended on the use/purpose of each lampstand.
-or-
The lampstands had different uses ⌊therefore their weight was different⌋ .
-or-
The lampstands ⌊had varying/different weights because the Levites⌋ used them for different purposes.

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