Carmanah M850 & M860 Self-Contained LED Lantern Instructions
v1.
1
Jan
201
6
14
SECTION 4
Lantern Selection
Overview
The Carmanah M800 lanterns are authorized replacements for a 155mm, 250mm, and all
previous self-contained LED lanterns on either a buoy or a fixed aid if it provides an acceptable
effective intensity and if its solar engine is capable of providing the required minimum 15-days
of autonomy.
District Considerations -- Intensity
Both the M850 and M860 lanterns provide a wide range of intensities. However, the capabilities
of the M860 lantern in the lower intensity settings are duplicated by the M850 lantern. Because
of cost considerations, use the M860 only at aid locations where the required effective intensities
and/or autonomy cannot be met with an M850 lantern. Use the M800 lantern solar sizing
program to determine the capabilities of these two lanterns for your specific application(s) (see
SECTION 2).
To determine the intensity requirements for any aid, Districts shall use the standard procedures
for selecting an ATON light signal as prescribed in the ATON Technical Manual (Chapter 6,
Section 6.B, page 6-1) and the Visual Signal Design Manual (Chapter 3). These references
describe how operational range, luminous range, light color, light characteristic, background
lighting, and meteorological visibility are used to calculate intensity needs.
After the effective intensity is determined, use the following table to find Nominal Range.
Nominal Range Table
Effective
Intensity
Nominal
Range
1 – 2
1
3 – 9
2
10 - 23
3
24 - 53
4
54 - 107
5
108 - 203
6
204 - 364
7
Under no circumstances should any lantern replace another lantern based solely on nominal
range. Instead, select an effective intensity equal to or slightly greater than that of the lantern
being replaced.
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