The bulb I used was also a reptiglo 10.0 26W, I am a little concerned that the UVA output caused some premature oxidisation of the THC in the trichomes closest to the lamp (10cm) as they were fully amber when the rest of the plant was still clear triches. For this reason, I'm interested in trying the Philips bulb which has UVB and no UVA.
I think i used the UV bulb incorrectly, from reading I've done, it would seem the best way is to mimic nature and use it for 1 to 3 hours after the midpoint of the 12 hour lights on cycle, thus mimicking the high UV of early afternoon. Perhaps this would give the required boost in cannabinoids and terpenoids without the damaging effects I saw.
Here's some pics of the damage I'm referring to, the first pic shows the amber triches from close to the bulb, the second pic is from the other side of the plant and has clear trichomes.
Also, the parts of the plant close to the bulb have turned purple, not sure if this is because the UV has damaged the chlorophylls or whether the colouring is down to greater levels of the carotenoid type terpenoids which are stimulated by the deep blue 400-450nm light put out by the Reptiglo bulb, the carotenoids are responsible for red, orange and yellow colours.
First pic is a cola near the UV lamp, second pic is the other side of the plant that wasn't getting much UV:
I think i used the UV bulb incorrectly, from reading I've done, it would seem the best way is to mimic nature and use it for 1 to 3 hours after the midpoint of the 12 hour lights on cycle, thus mimicking the high UV of early afternoon. Perhaps this would give the required boost in cannabinoids and terpenoids without the damaging effects I saw.
Here's some pics of the damage I'm referring to, the first pic shows the amber triches from close to the bulb, the second pic is from the other side of the plant and has clear trichomes.
Also, the parts of the plant close to the bulb have turned purple, not sure if this is because the UV has damaged the chlorophylls or whether the colouring is down to greater levels of the carotenoid type terpenoids which are stimulated by the deep blue 400-450nm light put out by the Reptiglo bulb, the carotenoids are responsible for red, orange and yellow colours.
First pic is a cola near the UV lamp, second pic is the other side of the plant that wasn't getting much UV: