yes you can use LED bulbs to grow, but be careful with that flood light style as they can create hot spots which can burn your plants , so you cannot keep them close like you would a CFLReally? I got like 20 of them for free but ok and thanks for the info
You need at least 5000 lumens to grow. 880 is almost nothing!
For veg you need 5000K-6500K (Daylight/Full Spectrum). 2700K (Warm White) is for flowering.
the OP said he has 20 bulbs, so that's 20 x 880 = 17,600 lumens