2. For a lamp that has a total luminous flux, of 4.5104 lm and total radiant flux, of 300 W, (a) what is the overall luminous efficiency, K for this lamp? (b) if this lamp has a luminous intensity of 1200 lm/sr, in the straight downward direction, (0), what is the illuminance, Iv, at distance 70 cm, directly below the lamp

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To solve the given problem well use the following formulas a Luminous efficiency K is defined as the ... View the full answer