Specs for LED panel and estimated electrical costs

Several radish seedlings are now up in both flats. It's possible that the marigold seedlings are less leggy in the flat under the LED lights. I'll post a photo in a few days when the seedlings are a bit larger.

I checked the air temperature at night and it's about 63 degrees. That should be the same for both flats.

Here are the specs for the LED panel:

• Body material: Thermoplastic
• Circuitry board material: Diecast Chrome
• 60 Blue light LEDs: 465nm (nanometer) wave length
• 165 Red light LEDs: 650nm (nanometer) wave length
• 165 + 60 = Total 225 LEDs
• Color: Red + Blue = Purple looking to the eyes
• Working Voltage: 12V or 110V-220V
• Power: 13.8 Watts
• Dimensions: 12 ¼ inches (30.5cm) square
• Thickness: Low profile 1.25"
• Power cord length: 48 inches
• Recommended coverage: one panel per 18 inches square
• LED life: Approx. 15 years used all year long. (60 years for spring starting of seedlings)

I tried to calculate the approximate cost per year using the figures from my current electric bill. It comes to around $10 if the lights are on 12 hours per day year round. If three panels can replace one fluorescent fixture with two 40 watt bulbs, then the cost is roughly $30 for the three LED panels and about $50 for the electricity for the fluorescent fixture.