For what it's worth, those cool white bulbs are not only cheaper, they're better for plants. The spectrum is much closer to the sun than the other kind, and instead of expensive grow bulbs I've switch over completely to those 99 cent cool whites in my propagators. Don't know anything about the composition of the gas in relation to other sources of electricity, though.

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Tim Vaughan, 48 years old, member Redeemer OPC, Santa Maria CA.