Tungsten filament lightbulbs with filters
My housemate is a lighting engineer, and has said he can get me some gel filters (sheets of the stuff) that he uses in his studios for altering the colour tempurature of standard tungsten filament light bulbs. In particular, he has blue tinted filters for producing either 7600K or 4800K light from standard bulbs.
i appreciate the use of filters would decrease the efficency of an already fairly inefficeint bulb, but would the resultant light be suitable for aquartic plant growth?
any one done this before?