What are the cheapest yet effective lightbulbs for indoor growin?
For all the lookin and price comparing and for there effectiveness,, that I did, CFL's such as plug and grow 250watts, avaible in both light spectrums, so you need two bulds with cfl's, one for the veg stage and one for flowering, blue/white then red.
That mean if your shipping to you and each buld is 40 it may work out at the same as other light but i still think it would be cheaper as you need a ballest. The cfl's plug and grow make are compact but elongated so are abit like long fluro tubes,,(im sure google envirogrow, evriolites, plug and grow to see what i mean),
You dont need ballest with cfls, and plug and grow , envriolites, envirogrow(they sell both) use a simple e40 screw socket which you can buy cheap of ebay if you want to make your own cable, or you can buy a shade with the wire built in or just the wire which hangs and just plugs into a socket or timer(in the wall/or extention cable).They also produce little to no heat.
I spent 100 uk pounds and got 2 bulds, 250watts, in 2700k and 6300k,(that roughly spectrum, id have to look on the box.)lasting about 8,000hrs,,it came with free reflector. shipping was 15 pounds.
Hope that informs you abit ,