23w 5000K are available from my distibutor for $13.99 CAD (in stock, no minimum purchase requirement). They are the most efficient too! 26w 2700K for flowering are also available for about the same price from the local big-box store.
Also, the T4 tubes inside have higher intensity than the T5 used in linear setups, and the reflector is precisely positioned for optimal reflection.
bxke1414: "Way to much money for no benefits, plus mine 26w CFL gives 1600 lumens compared to 1200 on that bulb, and I got 2 for $7."
The output of a non-reflector CFL is measured using an integrating sphere, it is measured BEFORE reflector losses.
The light output of a reflector CFL is measured AFTER reflection, and is a true measure of how much light will actually arrive at the target surface. Its not likely a hand-assembled external reflector will beat the optical perfection of an integrated one.