LED grow lights... input please.

[Curiosity]

I was told that as long as the mcd rating is high at high angle, they are MORE powerful than a 15 angle.

Example.
660nm, 4000mcd 15 degree angle.
660nm, 4000mcd, 100 degree angle.

This means that I am still getting 4000mcd spread further across the plants. Not in that narrow angle, so in theory those light a more than 4x stronger.

Lumens = Candelas*2pi*[1â??cos(theta)]
That makes it 0.85 vs. 29.5 lumens... about 30 times better.