Retail: $42.95
Price: $34.95
Availability: In Stock - Usually ships in 1 to 2 days.

What do these numbers mean?

Green Thumb Grow lights are great for helping orchids, dwarf citrus, bonsai and all houseplants to maintain healthy growth. This grow light comes with your choice of a full spectrum CFL or LED bulb. The 2700k bulb provides increased output in the red spectrum which promotes flowering in plants. The 5000K bulb is full spectrum bulb which promotes overall plant growth. Bulb outputs are equal to a 200W incandescent bulb. Bulbs fit into a standard medium socket. Requires 110/120 volt outlet.

Green Thumb Grow Light Includes

  • Black clamp-on fixture with 6' power cord
  • Choice of 23 watt LED or 40 watt CFL grow light bulb


  • Primary growing area: 1' x 1'
  • Secondary growing area: 2' x 2'
  • Recommended height above plants: 3" to 18"
  • Light output: 2600 lumens
  • Heat output: Very Low
  • Bulb life: (CFL) 10,000 hours, (LED) 25,000 hours


Growing Area
The growing areas listed above assume the light bulbs are being used in a fixture
with a reflector similar in quality to the ones offered on this web site.
Primary - Use this area if the grow light will be the main or only source of light for the plants. This includes areas where minimal light comes from windows or standard house/office lights.

Secondary - Use this area if the grow light will be used in a greenhouse or other area that receives direct sunlight for part of the day to supplement the light from the sun.
Heat Output
Type of Bulb
Average Bulb Temperature
LED & T5 Fluorescent
100 to 120° F
CFL (Compact Fluorescent)
130 to 180° F
220 to 260° F
MH and HPS
450 to 550° F
How Long Should Grow Lights Run?
This depends on the type of plant. Foliage plants need about 14-16 hours of light per day. Flowering plants need 12-16 hours of light per day. You should give most plants at least 8 hours of total darkness daily. Try to have the lights on at the same time every day. Using an automatic timer for your lights is recommended to make it easier.
The Electrical Cost to Run a Grow Light System
To get the operating cost per hour for a light, take the lights combined wattage, and divide it by 1000 to get the kilowatts used. Then multiply that number by the amount your electric company charges per kilowatt hour. HID lights will use the number of watts it emits per hour, ie; 600w system will use 600 watts per hour (regardless of spectrum).
(light wattage output / 1000) x electricity cost per kilowatt hour = Operating cost per hour
operating cost per hour x hours used per month = Operating cost per month

Item # 5605160, 5605165, 5605170, 5605175

Overall Customer Rating of 13 Reviews:

great light!

This light saved my lemon tree in January/February in Minnesota. It came ready to use with lightbulb and everything. My mom is going to get one for her lemon tree as well.


clip on grow light

I was able to clip on easily to a nearby shelf and make a growing spot to support the growth of several plants. All of the plants seem to be thriving better then the previous weeks that I did not have the lamp.

Happy customer!

High quality item that was shipped quickly and I appreciate the great communication. I will certainly buy from here again!

West Virginia

Green Thumb Clamp on Grow Light

Wonderful product and cost was less than anticipated.


This thing has gotten me about 12 lemons on my meyer tree from trying all summer to one month with it on! Magical light ! Thank you so much