Ev to Lux to Foot Candle measurement

[DTB]

Hi all,

I am taking measurements with my Sekonic light meter as it is all I have and I found this table on their website.

Conversion Chart

Anyone of much greater knowledge see this as a fairly accurate conversion for working out orchid lighting power?
I am using LED grow lights both diffused and focused so I am taking different measurements from within the tank and at certain plants to try and adjust how much lighting I need.
I am using Andys Orchid website and a few other sources to see how many Foot Candle power I need for each plant and then measuring my lighting using an EV photographic light meter.
It not very scientific but given my resources, its the best I can come up with.
Any suggestions, ideas or recommendation on more accurately converting measurements?