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The ones on ebay don't really equal a 400w hps and those ufo one's certainly are not equivalent to a 600w hps. Good led lights which are extremely expensive I am sure would work well but I only know people who have used the moderately priced, crappy ufo and ebay ones with results far under expectation.
PotHead - Most Operations get busted because of loose lips, informants and material collected in trash. Heat and electricity are usually used to gain more info etc for a warrant.
On the other hand... The sheriff in my county does do fly overs at harvest for outdoor grows... there is also rumors that when they fly over they use thermal scanners.
I only grow indoors in the winter so i dont worry bout it
As far as technology goes the leds would be less heat, allowing for less venting. Perhaps one day LEDs will lead us into new territory but for now all the research i see is LED in Aqauriums and Coral Culture.