When I last wrote about T5 replacement bulbs, they were still pretty expensive. Now we have an option that uses half the energy, has even better output, and only costs $25-30 a piece. I've been experimenting with these bulbs for a few months now, and my plants are super happy. Just plug them straight into a fluorescent fixture, and they are ready to go. For the price and quality, I haven't seen a better deal.
Active Grow has two spectrums available. They draw 24 watts a piece, generate very little heat and last a long time. Plus, no worries about cracking them and spewing mercury all over yourself.
Here is their spec sheet:
Here's an image of my plants under the Active Grow LEDs. It turns out that LED lights don't change the nutrient uptake patterns of plants at all. You can use the same nutrient regimen. You just need to make sure you get extra dehumidifiers since there won't be as much heat to burn off all of the moisture in the room.
Jennifer Martin is a pioneer in American cannabis cloning. Having supplied Bay Area marijuana dispensaries since the passage of Prop 215 in 1996, she helped bring over 2 million marijuana plants into the world. She also won the 1998 San Francisco Bay Area Cannabis Cup with the strain Bubbleberry, by a 32-point spread on a scale of 200. Jennifer lived in Amsterdam in the mid 90's and learned all about the industry and world-class cannabis products.