tips of my bud are turning white. the bud itself its trurning into white

What is this its not just on top cola I'm using 2 600 watt leds

I don't think its to hot only about 84 degrees

Buds which have been bleached tend to be low potency or even have no potency (no available THC or other cannabinoids).

But is it bleach. Or reflowering or some type of genetic mutation I have 5 plants in the same grow space the 3 that are affected are sativa of an unknown variety and they are taller but its not at the closest point of light about 2 to 3 feet away actually I'm using 2 600 watt leds

Looks like bleaching from light stress maybe. Real this about halfway down.
http://www.growweedeasy.com/cannabis-light-burn

Ok thank you I'm first time grower and all the books only go so far experience is appreciated