Contrary to popular belief, either cool white or warm white fluoros will do just about equally well for vegging. It's not an all or nothing proposition if you don't use a fluoro specially rated for horticulture. I've vegged tons of mums and cuttings under plain old 4', 40W workshop fluoros.

If you have absolutely no alternative but to flower with a fluoro, use warm whites, but if all you have is cool whites, they will do.

Fluoros used for flowering will produce small, fluffy buds. If you want hard nuggies, use a HPS lamp which suits your space (~50W per sq ft).

you got that right! starting to get boring. some sort of required knowledge test before you post.


when will the seed i just ordered be finished? how much bud will i get?

NEVER and ZERO.

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i'm the guy i've always wanted to be

Sorry to bump this topic once again, but I have recently started to grow with a 30 watt full spectrum energy saving bulb. It gives off a nice bright white colour instead of the usual ugly yellow-ish light. I have the lamp about a couple of inches away from the seedling. Suprisingly, they are growing very nicely, but what I need to know is will this bulb work for the rest of the grow (both veg and flower stages)???

Assuming this is a CFL (like the pics above) check the packaging and see if you can find the color temp listed.

It's going to be better for either vegging or flowering, but as the poster above said if it's all you have it will still work, just not as well.

Ideally you want "Daylight" bulbs for vegging (color temp ~6500k) and "soft white" for flowering (2700k). The "cool white" bulbs/tubes you see are typically around 4000k -- not ideal for either, but will compromise less on flowering than than a daylight, and less on vegging than a soft.


You might like to have a look at this:

Color temperature: cfl quality faq: cfl faqs: City of Fort Collins
(ignore the entries for incandescent and halogen, as noted above the spectrum is all wrong.)

And also this excellent CFL FAQ:

Kamel's CFL Guide - Grasscity.com Forums

halogens are wrong spectrum