candela or lumens
candela or lumens
(OP)
I am looking at some lighting in Cooper-Crouse Hinds catalog and have a question about a conversion factor.
The catalog gives an example of a type of light and if you use a different watt lamp, it gives a conversion factor. Am I to multiply the conversion factor to the number of lumens or to the candelas found for the given lamp example?
For example, the catalog example uses a 175W Mercury Vapor 8600 lumen lamp. The candelas for this lamp is 1443. If I am using a mercury-halide lamp instead, the conversion factor is 1.63. Now am I to multiply this conversion factor by the lumens or candelas? I am very new to lighting and learning as I go.
Thanks for the help!
The catalog gives an example of a type of light and if you use a different watt lamp, it gives a conversion factor. Am I to multiply the conversion factor to the number of lumens or to the candelas found for the given lamp example?
For example, the catalog example uses a 175W Mercury Vapor 8600 lumen lamp. The candelas for this lamp is 1443. If I am using a mercury-halide lamp instead, the conversion factor is 1.63. Now am I to multiply this conversion factor by the lumens or candelas? I am very new to lighting and learning as I go.
Thanks for the help!





RE: candela or lumens
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Better yet refer to IES reference book.
candela and lumens are related but not interchangeable. They are two diffrent quantities.
For lighting level calcaulations all you need to know is lumens from a light fixture, normally.
RE: candela or lumens
RE: candela or lumens
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Seems pretty clear to me.
TTFN
RE: candela or lumens
So my original question was, this specific conversion factor, 1.63, am I multiplying it by the original lumens listed in the mercury vapor lamp or the candelas found from the chart of the mercury vapor lamp?
RE: candela or lumens
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RE: candela or lumens
TTFN
RE: candela or lumens
Did you read the note in the box where the conversion factors are given, that you are referring to on page 4? Where does it say it is for cadela to lumens? Nor there is any coversion factor of 1.63. Those factors are to adjust for wattage of the incandecent lamps, as the table is for 300W.