Yes, those are correct. They've added some suffixes to be politically correct.

ECO = Ecolux. Their own designation. Less mercury, probably better efficiency, too.
CVR = shatterproof (CoVeR). Filters UV, too.

F40KB = 3000K Best for flower, but not powerful enough to do a good job flowering cannabis. These can cause stretching in veg if there's not enough blue to offset them.

F40CW = 4100K These are the best tubes you have for veg. Probably work fine. If in doubt just buy some F40D's @ 6500K. (probably stands for "daylight." But why that's bluer than "cool white" is beyond me --that's why I go by the color temps)

Those plant/aquarium bulbs are for looking at a plant under, not growing (unfortunately). They're 3100K, which'd be okay for flower, but they only have half the lumen output of the KB's. Flowers look real purty under them, tho'... :wtf:

oh and probably a dumb question but:
Nope, not dumb, and not a simple answer.

Conventional light sources emit combinations of different wavelengths.

To learn what they are, seek out the "Spectral Distribution graph" for each.

Ignore the "color rendering index" (CRI) that's just how "natural" the light supposedly looks to our eyes, compared to sunlight. Whose eyes, and what time of day in what part of the planet they're talking about is a mystery to me, however. :what:

Our eyes are most sensitive in the green / yellow wavelengths. Plants reject (reflect) those wavelengths, to a large degree, and that's why they appear green to our eyes.

HTH, Hermie
DreadedHermie Reviewed by DreadedHermie on . fluros, which bulb is better? i understand about cfls, and hps/mh bulbs being better, but i'm going down the cheap route to headsmoke. right now i'm growing 3 plants, just for future personal use ideally. they're only a week in, so still veg. i have them in a very small white closet with 2 4ft fluros above, and just for giggles a "spot-gro" bulb hanging above that, sending off a bit of bluish light to add to the fun. i found a mass of bulbs out in my fathers workshop i can use, but i'm not sure what the best combinations Rating: 5