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   Better than Wolves has the opposite to that (transparent when retdosne-unpowered, and a light block when retdosne-powered). I'd go with something more different and ambitious: a block that will be transparent when any of the panels get retdosne current, or stay opaque with the same texture that the blocks around it (like the checkpoints from the Portal Gun mod) when unpowered. This way you can have a, for example, 9 9  window  that would only require to give/take power to one of the blocks in the  frame  to change the state. Combined with a light sensor block (or a mob/player/whatever detector) it can make wonderfull stuff (like the big window that gets opaque at night, but turns transparent at day, which can be combined with the RP light blocks to get a room that will use natural light during daytime, and  electrical  light during nighttime  without giving away light outside, for example).