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According to the Chazon Ish, creating a circuitHere is a violation of the melacha of Boneh, building, and therefore switching any bulb to "on" would be considered an Issur Di'oraysa.article by Rabbi Michael Broyde & Rabbi Howard Jachter that discusses the entire topic: http://www.daat.ac.il/daat/english/journal/broyde_1.htm

(side note regarding heating a bulb before it becomes yad soledes- just because the glass encasing of the bulb isn't yad soledes doesn't establish that the filament itself is not.)

According to the Chazon Ish, creating a circuit is a violation of the melacha of Boneh, building, and therefore switching any bulb to "on" would be considered an Issur Di'oraysa. (side note regarding heating a bulb before it becomes yad soledes- just because the glass encasing of the bulb isn't yad soledes doesn't establish that the filament itself is not.)

Here is an article by Rabbi Michael Broyde & Rabbi Howard Jachter that discusses the entire topic: http://www.daat.ac.il/daat/english/journal/broyde_1.htm

(side note regarding heating a bulb before it becomes yad soledes- just because the glass encasing of the bulb isn't yad soledes doesn't establish that the filament itself is not.)

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According to the Chazon Ish, creating a circuit is a violation of the melacha of Boneh, building, and therefore switching any bulb to "on" would be considered an Issur Di'oraysa. (side note regarding heating a bulb before it becomes yad soledes- just because the glass encasing of the bulb isn't yad soledes doesn't establish that the filament itself is not.)