Ecscuba said: It's in my GH and I think getting plenty of light. Temp in there runs between 53 and 65. !
Is that the temperature during the day, or is it the difference between day and night? If only during the day, what is the night temperature?
With the lights, it would depend on what you are trying to do. If you think the problem is light intensity (brightness, or the amount of light) then you'd need more lights such as fluorescents. If you're trying to alter the photoperiod (length of day) by increasing the hours of light then an incandescent is fine and that doesn't take a lot of light (the wavelength is what's important). But, having said that, you need to be very careful about lengthening the hours of light per day for spinach or it will bolt. How many hours of light are they getting currently, natural plus artificial?
Also what is your fertilizer analysis?
