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I'm building a platform out in the water, sort of like an oil rig, and I'm realizing that the area beneath my platform is going to become completely dark at all times. In order to prevent that, how can I let beams of sunlight through? I'd prefer not to use glass, or to just make arbitrary holes in the platform.

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3 Answers 3

If your only goal is to let "natural light" Sunlight / Glass are your only options. If, however, you'd be happy with something with the same Luminosity as natural light, you have a couple options.

Fire, and Magma (still or flows) give off a luminance of 15, the same value of natural light, and magma in particular, due to its flow, can light a wide area. However, both of these are dangerous if walked into.

Glowstone and Jack-o-lanterns both give 15 luminance as well (compare this to a torch's 14; due to the exponential brightness programmed into the game, the difference is actually pretty noticeable. A Torch gives only 80% of the brightess as luminosity 15 sources do.) are both safe to walk on / bump into and function perfectly well underwater (Torches, magma, etc. are destroyed on contact with water).

A final option would be to simply alter the texture (or download a texture pack) of the glass block, so that it appears as something else (but still allows light to pass through).

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I've seen some good answers on this question so far, but there is a way to to light the underside of the platform without making holes that go all the way through by using artificial means like lava.

If the platform is at least 3 blocks high, you can hollow out the middle layer and fill it with lava, with a pattern of glass below like so:

XXXXXXXXXXXXXXX  X = Stone (or whatever)
XLLLLLLLLLLLLLX  L = Lava
X^XXX^XXX^XXX^X  ^ = Glass

Perhaps you could pattern the glass on the bottom layer to resemble flourescent lighting. If your building material is flammable, you can replace the lava with lightstone or torches.

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Hmm, I'd never thought of this. My fortress o' Doom may have a new lighting scheme. –  Rapida Nov 22 '10 at 2:50
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And you get free heating ;-) –  user4040 Feb 17 '11 at 2:42
    
What's "Or w/e" ? (could you edit to clarify that?) –  Denilson Sá Aug 10 '11 at 21:09
    
Lava will not shine downward like sunlight does. If the platform is more than 13 blocks above the water, this won't light the water at all. –  Kevin Reid Aug 10 '11 at 23:29
    
@KevinReid if he is building an oilrig with a base of more than 13 blocks high its like fishing of a skyskraper with a bamboo fishingrod. –  Marco Geertsma Jun 12 '13 at 11:16

You can use the "X light 9000" :)

It is simply a layer of glass squarely above the area you're trying to mine on, with an outward "lip" that prevents mob spawned outside the skylight area to get within (and break the glass). Make sure however that you prevent mobs from spawning inside that area!

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i still maintain it is a brilliant idea –  bronzebeard Feb 17 '11 at 0:51
    
This answer has nothing to do with the question. *Bzzt!* –  SevenSidedDie Aug 12 '11 at 1:57
    
Um... clarification needed –  Joe the Person Aug 30 '11 at 23:16
    
Um... Last time I checked, mobs cannot break glass. Unless I read that wrong. –  Jeffrey Lin Nov 21 '12 at 2:35

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