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The formulas to calculate PPFD (µmol/sm²) from Lux (lx) are:
\[ \text{PPFD SUN} = \frac{\text{Lux}}{54} \]
\[ \text{PPFD HPS SON-T} = \frac{\text{Lux}}{74} \]
\[ \text{PPFD Metal Halide} = \frac{\text{Lux}}{69} \]
Where:
Lux (lx) is a unit of illuminance, representing the amount of light that hits a surface. PPFD (µmol/sm²) is a measure of the number of photosynthetically active photons that fall on a given surface area per second. The conversion from lux to PPFD depends on the type of light source and its spectrum.
Let's assume the following value:
Using the formulas:
\[ \text{PPFD SUN} = \frac{20000}{54} = 370.37 \mu mol/sm^2 \]
\[ \text{PPFD HPS SON-T} = \frac{20000}{74} = 270.27 \mu mol/sm^2 \]
\[ \text{PPFD Metal Halide} = \frac{20000}{69} = 289.86 \mu mol/sm^2 \]
The PPFD values are 370.37 µmol/sm² for SUN, 270.27 µmol/sm² for HPS SON-T, and 289.86 µmol/sm² for Metal Halide.
| Lux (lx) | PPFD SUN (µmol/sm²) | PPFD HPS SON-T (µmol/sm²) | PPFD Metal Halide (µmol/sm²) |
|---|---|---|---|
| 1000 | 18.519 | 13.514 | 14.493 |
| 2000 | 37.037 | 27.027 | 28.986 |
| 3000 | 55.556 | 40.541 | 43.478 |
| 4000 | 74.074 | 54.054 | 57.971 |
| 5000 | 92.593 | 67.568 | 72.464 |
| 6000 | 111.111 | 81.081 | 86.957 |
| 7000 | 129.630 | 94.595 | 101.449 |
| 8000 | 148.148 | 108.108 | 115.942 |
| 9000 | 166.667 | 121.622 | 130.435 |
| 10000 | 185.185 | 135.135 | 144.928 |
| 11000 | 203.704 | 148.649 | 159.420 |
| 12000 | 222.222 | 162.162 | 173.913 |
| 13000 | 240.741 | 175.676 | 188.406 |
| 14000 | 259.259 | 189.189 | 202.899 |
| 15000 | 277.778 | 202.703 | 217.391 |
| 16000 | 296.296 | 216.216 | 231.884 |
| 17000 | 314.815 | 229.730 | 246.377 |
| 18000 | 333.333 | 243.243 | 260.870 |
| 19000 | 351.852 | 256.757 | 275.362 |
| 20000 | 370.370 | 270.270 | 289.855 |
| 21000 | 388.889 | 283.784 | 304.348 |
| 22000 | 407.407 | 297.297 | 318.841 |
| 23000 | 425.926 | 310.811 | 333.333 |
| 24000 | 444.444 | 324.324 | 347.826 |
| 25000 | 462.963 | 337.838 | 362.319 |
| 26000 | 481.481 | 351.351 | 376.812 |
| 27000 | 500.000 | 364.865 | 391.304 |
| 28000 | 518.519 | 378.378 | 405.797 |
| 29000 | 537.037 | 391.892 | 420.290 |
| 30000 | 555.556 | 405.405 | 434.783 |
| 31000 | 574.074 | 418.919 | 449.275 |
| 32000 | 592.593 | 432.432 | 463.768 |
| 33000 | 611.111 | 445.946 | 478.261 |
| 34000 | 629.630 | 459.459 | 492.754 |
| 35000 | 648.148 | 472.973 | 507.246 |
| 36000 | 666.667 | 486.486 | 521.739 |
| 37000 | 685.185 | 500.000 | 536.232 |
| 38000 | 703.704 | 513.514 | 550.725 |
| 39000 | 722.222 | 527.027 | 565.217 |
| 40000 | 740.741 | 540.541 | 579.710 |
| 41000 | 759.259 | 554.054 | 594.203 |
| 42000 | 777.778 | 567.568 | 608.696 |
| 43000 | 796.296 | 581.081 | 623.188 |
| 44000 | 814.815 | 594.595 | 637.681 |
| 45000 | 833.333 | 608.108 | 652.174 |
| 46000 | 851.852 | 621.622 | 666.667 |
| 47000 | 870.370 | 635.135 | 681.159 |
| 48000 | 888.889 | 648.649 | 695.652 |
| 49000 | 907.407 | 662.162 | 710.145 |
| 50000 | 925.926 | 675.676 | 724.638 |
| 51000 | 944.444 | 689.189 | 739.130 |
| 52000 | 962.963 | 702.703 | 753.623 |
| 53000 | 981.481 | 716.216 | 768.116 |
| 54000 | 1,000.000 | 729.730 | 782.609 |
| 55000 | 1,018.519 | 743.243 | 797.101 |
| 56000 | 1,037.037 | 756.757 | 811.594 |
| 57000 | 1,055.556 | 770.270 | 826.087 |
| 58000 | 1,074.074 | 783.784 | 840.580 |
| 59000 | 1,092.593 | 797.297 | 855.072 |
| 60000 | 1,111.111 | 810.811 | 869.565 |
| 61000 | 1,129.630 | 824.324 | 884.058 |
| 62000 | 1,148.148 | 837.838 | 898.551 |
| 63000 | 1,166.667 | 851.351 | 913.043 |
| 64000 | 1,185.185 | 864.865 | 927.536 |
| 65000 | 1,203.704 | 878.378 | 942.029 |
| 66000 | 1,222.222 | 891.892 | 956.522 |
| 67000 | 1,240.741 | 905.405 | 971.014 |
| 68000 | 1,259.259 | 918.919 | 985.507 |
| 69000 | 1,277.778 | 932.432 | 1,000.000 |
| 70000 | 1,296.296 | 945.946 | 1,014.493 |
| 71000 | 1,314.815 | 959.459 | 1,028.986 |
| 72000 | 1,333.333 | 972.973 | 1,043.478 |
| 73000 | 1,351.852 | 986.486 | 1,057.971 |
| 74000 | 1,370.370 | 1,000.000 | 1,072.464 |
| 75000 | 1,388.889 | 1,013.514 | 1,086.957 |
| 76000 | 1,407.407 | 1,027.027 | 1,101.449 |
| 77000 | 1,425.926 | 1,040.541 | 1,115.942 |
| 78000 | 1,444.444 | 1,054.054 | 1,130.435 |
| 79000 | 1,462.963 | 1,067.568 | 1,144.928 |
| 80000 | 1,481.481 | 1,081.081 | 1,159.420 |
| 81000 | 1,500.000 | 1,094.595 | 1,173.913 |
| 82000 | 1,518.519 | 1,108.108 | 1,188.406 |
| 83000 | 1,537.037 | 1,121.622 | 1,202.899 |
| 84000 | 1,555.556 | 1,135.135 | 1,217.391 |
| 85000 | 1,574.074 | 1,148.649 | 1,231.884 |
| 86000 | 1,592.593 | 1,162.162 | 1,246.377 |
| 87000 | 1,611.111 | 1,175.676 | 1,260.870 |
| 88000 | 1,629.630 | 1,189.189 | 1,275.362 |
| 89000 | 1,648.148 | 1,202.703 | 1,289.855 |
| 90000 | 1,666.667 | 1,216.216 | 1,304.348 |
| 91000 | 1,685.185 | 1,229.730 | 1,318.841 |
| 92000 | 1,703.704 | 1,243.243 | 1,333.333 |
| 93000 | 1,722.222 | 1,256.757 | 1,347.826 |
| 94000 | 1,740.741 | 1,270.270 | 1,362.319 |
| 95000 | 1,759.259 | 1,283.784 | 1,376.812 |
| 96000 | 1,777.778 | 1,297.297 | 1,391.304 |
| 97000 | 1,796.296 | 1,310.811 | 1,405.797 |
| 98000 | 1,814.815 | 1,324.324 | 1,420.290 |
| 99000 | 1,833.333 | 1,337.838 | 1,434.783 |
| 100000 | 1,851.852 | 1,351.351 | 1,449.275 |