GrowLED Thinklux PAR38 - LED Grow Light Bulb for Garden, Hydroponic, and Greenhouse - 16.5 Watts, 90 Watt Equal, Red/Blue Spectrum, Dimmable, 40°Beam Angle, IP55 Dustproof and Waterproof, Pack of 1

We have used these T8 Grow Tubes from ThinkLux for 9 months and have returned again and again to purchase 80+ of them as we expand our non-profit's project to grow year-round fresh food for local families. From our experience trying different lighting solutions, these ThinkLux tubes have proven to be the best performing and by far the most cost effective for hydroponic basil, kale, peas, rosemary, strawberries and several varieties of lettuce and salad greens. Growth is fast, lighting is cool and even, power consumption is extremely low, and there's no chance of burning even tiny seedlings. We have a light spectrum analyzer and the actual measured curve of plant-usable red and blue spectrum is exactly as represented on the packaging and product Website. Light output levels are extremely consistent between tubes purchased up to 9 months apart. No drop in light output has been measured over 9 months. We couldn't be more satisfied and plan to use many, many more of these in the future. The latest project pictured is a hydroponic rack fully surrounded with T8 Grow Tubes for growing a dense stand of climbing peas and beans.Updated July 4 2018 - All of our LED tubes are still working wonderfully! Just ordered 24 more for our next indoor garden expansion.

If you are not familiar with wiring and converting a florescent lamp to accept these. Either look for a different product or have someone else do it for you. That being said, they work great and instructions were easy to follow.

these work great for sprouting and cloning. gave it a try to grow, you will need all 4 bulbs in a small space.. not as good as natural light but i got some tomatoes and bell peppers.

I was hoping they would be brighter but all 4 of them combined hardly put out a good amount of light. I’m still using them but I had to supplement with more lights to get the desired effect. But it’s a good lesson learned and from now on I’ll be more mindful of what I buy as far as grow lights.

I love the lights for the ways they make my indoor lettuce garden grow. Mini Romaine, Red sails and Black Simpson thrive with these lights. I have two shelves with four lights in two separate hanging fixtures. We tried one fixture per shelf but there was not enough coverage. The lights for the lettuce are on 24/7. The only thing I don’t like is the pinkness and brightness of the lights in my dining room.

I grow Pacific Northwest Native plants. The GrowLEDs work very well for them because they run cool, and the PNW natives need it to be cool. So far, they like the spectrum, too. Plus I have received great support from customer service.

got the product, it took 4 days, and I have Prime, come to find out you have to rewire your fixture, did everything correct, and still don't work.DON'T WASTE YOUR MONEY ON THIS JUNK. MORE CRAP FROM CHINA!!!

Just got these in and installed, can't wait to see how much a difference they make on all my seedlings!