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Conversation Between Hoppy and treelimbjim
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  1. treelimbjim
    05-09-2012 03:23 AM
    treelimbjim
    Thank you for your contributions.

    Trying to answer "How many (and type) LEDs to use my 70 gal?" or simply, "Is 24 XPG enough? 36?"

    I've been estimating with spreadsheet V.3.

    Tank: 48wx18dx20h, 3" substrate

    Frame: 1.5" aluminum extrusions, 3 x 48" rails on 5.25" centers.

    Mod/add:
    Table for PAR est. for L,M,H light (see below)
    LED height: Tank_height + LED_Height_above_water - Substrate_depth
    Conditional format: 1) PAR background is blue, green, orange for L,M,H light. 2) current background is red when >rating.
    Table for Spread with LED_Height and Cone_Angle

    I'm not clear about how the "rows" work. I'm trying the geometric mean of LED_spacing and my LED_row_spacing.
    Trying to validate the calculations, I ran across 84212-designing-building-led-fixture-22.html#post1102937
    ... and the spreadsheet isn't coming close to real world observations.

    Where to go from here?

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