simple lighting question

which of these lights would be okay from sprouting to flowering stage for about 4 plants?:

825 lumens soft white 13 watt bulb
1275 lumens 20 watt 3000k color temp 70 c.r.i.? (p.s. what is c.r.i.?)
...or a 400 lumens 8 watt 4100k color temp 60 c.r.i.

i think most of these were fluorescents.

recommed some good lights for this stage and links (hopefully).

patch0i said:

which of these lights would be okay from sprouting to flowering stage for about 4 plants?:

825 lumens soft white 13 watt bulb
1275 lumens 20 watt 3000k color temp 70 c.r.i.? (p.s. what is c.r.i.?)
...or a 400 lumens 8 watt 4100k color temp 60 c.r.i.

Click to expand...

None of them really.

You want to try and get a fluorescent in the right colour temperature, that out puts the right number of lumens at the 3 different stages of growth.

In seedling/clone stage you want about 500 lumens per sq foot at a distance of 1 ft, at vegetative growth stage you want about 2,500 lumens per square foot at 1 foot, both with a colour temperature of 6,400k, in flowering you want about 10,000 lumens per sq foot at a distance of 1 foot with a colour temperature of 2,700k.

CRI is an acronym for Colour Rendering Index, and is a scale for the accuracy of the bulb displaying the different colours of the visible light spectrum measured against a standard CRI of 100. Most fluorescents for plant growth should have a CRI of around 80-85.