Do you know the foot candles of a 2-light fixture would produce using T8 LED bulbs?

I'm looking at the Photon T8 LED Grow Light Tubes for Horticulture. I have a 2 tier grow light for houseplants (live in an apartment with trees to the south and an overhang entry to the north.) I currently have the two 40-watt T8 fluorescent bulbs that came with it, but they have been in there about 1 3/4 years, so now it's definitely time to replace the bulbs. Are the Photon LED 4000K good for flowering? Do you know the footcandles that a 2-light fixture would produce using these bulbs? Are these brighter than a 40-watt T8 fluorescent bulb?

Our CENTRIC DAYLIGHT™ Full Spectrum Flicker-Free T8 LED Tube Light provides 1800 lumens of output, which is equivalent to 32W fluorescent lamps.

For a more complete answer regarding the operating temperature of the LED lighting about the spacing between plants and fixtures, it might be helpful to know that we measure an average temperature rise of 54°F (30°C) over ambient temperatures when the LED products are operating. 

​Hopefully, this average temperature rise helps identify the ideal distance between the plants and the light fixture, based on the relative heat sensitivity of the plants being grown. 

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Horticultural lighting (grow lights, vertical farms, indoor growing)T8 LED tube lights

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