Sunlight, Inc.
株式会社 サンライトはソーラー自発光システムによるLEDライトを開発しています。
Sunlight, Inc.
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FAQ(Frequently Asked Question): Supplementary explanation:

Comparison of amorphous and monocrystalline
  1. Light to power conversion efficiency
    (1000W / m2 => approximate conversion efficiency during a fine weather in a natural environment)
    Amorphous solar cells are at 6-7%, while single crystal solar cells are at 13-19% (Which is almost three times higher than amorphous)

  2. Linearity of changes in output due to illuminance level
    In case of amorphous solar cells the difference from highest to lowest level of illumination is about 5000 lux.
    (Conversion efficiency almost not suffering)
    In case of a single crystal solar cells the difference is astonishing 20000 lux.
    (Poor conversion efficiency at low illumination)

    There is a case of amorphous solar cells reversing the conversion efficiency under low illumination conditions.
    The output at low illumination can guarantee.

  3. Contrast of characteristics of a typical solar cell
株式会社 サンライト - 説明図
As illustrated by figure 1, output current varies greatly by illumination level.
"Contrast linearity" has a great effect on the output current.

株式会社 サンライト - 説明図
figure 2: You might find amorphous cells more efficient in low light conditions.
(AmorphousÅf curve is less inclined)
  • As single crystal solar cells are performing their best only during the clear weather, it is necessary to make use of the strong point of amorphous cells during the cloudy weather or other low illuminance conditions.
  • Speaking of voltage / illuminance ratio, amorphous have it at about 0.6V Pmax per cell in high illumination conditions and about 0.5V in low.
    The single-crystal cells are at about 0.5V Pmax per cell in high illumination conditions and about 0.3V in low. This leaves us with a good choice variety to suit.
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Tricks to shorten charging time

The charge time is shortened by using the following circuit configuration designed for the specific capacitor we use.

株式会社 サンライト - 説明図
Figure 3: When the charging voltage is low, the capacitor will be charged with a parallel current.

株式会社 サンライト - 説明図
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Characteristics of products' photosensor
株式会社 サンライト - 説明図
Figure 5: Sensitivity of photosensor we use is very close to that of human eye.
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Waterproof structure used to protect our embedded self light emitting products
株式会社 サンライト - 説明図

Commentary:

  • Because of nature of the environment in which embedded lights are usually used, the materials of lower and upper cases are expected to expand, shrink and twist.
  • As shown on figure 6, elastic weather adhesive is used in our products to provide a buffering effect for the lateral movement of the upper and lower cases.
  • However, because during the sudden temperature changes materials of the cases will show different speed of physical reaction they will get cracks or break anyway by moving in different direction if they are not firmly fixed to each other.
    So, because mechanical locking is still important we also provide you with two ways to lock the device by screw to use in appropriate conditions.
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The relation between rated voltage and accumulator's capacity

株式会社 サンライト - 説明図

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What is solar LED?
Product information
Achievements examples
Company profile
FAQ Contact us Site map Go to JPN site.
Sunlight, Inc.
株式会社 サンライトはソーラー自発光システムによるLEDライトを開発しています。
Sunlight, Inc.
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