SL-300-1D5 Series
13-21NM Marine Lanterns
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Let’s try a practical example
Thermal cap example:
Case 1:
SL-300-1D5-1-W, White, 17NM, Flash Character Fl(3+1) 18s
[1.5s on,1.5s off,1.5s on,1.5s off,1.5s on,4.5s off,1.5s on,4.5s off] 33.3%
1. Calculate the Flash Character Duty cycle (%)
= (1.5+1.5+1.5+1.5)/(1.5+1.5+1.5+1.5+1.5+4.5+1.5+4.5)*100 = 33.3%
2. With a range of 17NM, the Effective Intensity (cd) is determined as
= 30,988cd
3. Using IALA E-200-4, the Peak Intensity (cd) is
= 35,120cd
4. Calculate the desired Intensity step setting (0 to 32=100%) based upon the SL-300-1-W Maximum
Peak Intensity (cd)
= 35,120(cd) / 94,400(cd) * 32(steps) = 12 (rounded up)
5. Calculate the MULTIPLIER (%)
= 33.3% (duty cycle) * (12/32*100%) = 12.5%
6. Compare this to the Max Power Thermal Limit for a SL-300-1D5-W
= 37.5%
The MULTIPLIER < 37.5% and is below the Max Power Thermal Limit.
7. With an Intensity Step of 25, recalculate the range.
Peak Intensity = (13/32) * 94,400cd
= 38,350cd
8. The new Effective Intensity is calculated as approximately 31,940cd
9. The range is confirmed as 17.2NM. (PASS)
