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A sun lamp is a lamp that is used to continue the growth of plants indoors or outside, even when no sunlight is shining. A sun lamp uses over 10 times as much power as a standing lamp does, and therefore shouldn't be used to only light up a room, especially if it's a small room.
Sun lamps are primarily used indoors near hydroponics basins in order to provide the indoor plants with light that is bright enough for the plants to grow without sunlight. If a sun lamp is left outside, it can become a potential hazard if it begins to rain. If this was to occur, the sun lamp has a chance to short circuit, starting a fire and damaging anything around the lamp.
A sun lamp will brightly illuminate (100%) tiles within a five-block radius as shown:
Tiles outside the highlighted area will still be illuminated, but only at 60% or less.
It is possible to fit 24 hydroponics basins inside the "brightly lit" area of a sun lamp with the following configuration:
If there is a roof over the hydroponics area, it may be wise to use the four empty tiles for roof support columns. This is not necessary if there are supports immediately outside the sun lamp's radius.
How to prevent short circuits
If it is raining on the sunlamp it WILL short circuit and cause fires. To prevent this, simply build a wall and build some roofs connected to the wall over the sun lamp.
Roof under construction. Build walls first, then sell unnecessary walls and last build the lamp ▩ ▩ ▩ ▩ ◉ ▩ ▢ ▢ ▢ ▩ ▩ ▩
Please note that a recent change in how roofing is created has made it so that there is a hole in the middle. The fix is to place the lamp on a square the walls previously stood on.
Roof done, the lamp is protected & the unnecessary walls has been sold. (the lamp is moved to be under the roof) ◉ ▢ ▩ ▢ ▢ ▢