Led lamps (like CFLs) are horribly personal for the specifier or supplier. We have come to the conclusion that only personal observation of a lamp in the intended lampholder / colour setting will give the reassurance that the customer will get what they want. We fitted a lamp in 10 positions...
Notching the underside of a joist effectively reduces the depth of the joist by the depth of the notch, PLUS a further reduction for a stress concentration factor. Unless you are sure (and justifiably sure as well) don't.
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