correct lighting for mini phals

[Lucian]

Hi,
We are trying to work out the lighting for our mini phals.

We are growing indoors under lights. Our set up is a 4ft x 18in shelves with humidity trays. The tops of the trays are 18in from the lights and the phals are 11in from the lights.
We have two banks of two 48in x T12 Daylight 40w flourescent tubes although we only have one bank in use.The lights are on 12hrs daily and supplemented by normal indoor daylight.

We also have spare T8 fittings we could use, if that would be better.

We are trying to juggle with lighting and heat.

To test the lighting, we have an Environmental Concepts Plant Light Intensity Meter. With the switch set to Flourescent, the meter is reading
500fc at plant height using one bank of 2 x 40w T12 Daylight tubes. Temperature is 79f and humidity 59%

500fc seems way too low so, should we look at the Sun reading 5000fc?

We have tried different permutations of lights but the more tubes we add, the temperature increases into the mid 80's and humidity decreases into 30's. We have noticed burning of the leaves with more lights.

As it stands, our plants are looking good in as much as the leaves are glossy, there is plenty or root growth and we have had an abundance of keikis.

Our questions are these.

1. is our current set up, light temp humidity, causing too much keiki growth and will this affect spike growth?
2. what should be the correct fc for phals? The readings are either too low (500) or too high (5000)


We are moving the shelves to another room this weekend so if we need to make changes, now would be a good time.

thanks