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I bought these as a replacement for some plant growing tube lights. I needed 4 foot long bulbs (ie. 48 inches). Although the title of this product says "LightWise LWF54T5HO865 8pack 4 FT 6500K T5 HO Fluorescent Grow Light Bulbs (8, 6500k - Blue - Veg)", they are NOT 48 INCHES LONG!
They are actually about 46 and some inches long. They should be called "approximately 46 inch bulbs" in their title.
I could not find any were in the posting the actual distance of the pins; so I thought I would take a chance even though others had a problem with this fitting their light fixtures. They did not fit mine either. The distance between the pins center to center is 3/16 of an inch. I only rated the product a 3 star because the seller has not posted the distance between the pins even though many people have had a problem with this. I do not know how the lights work because they would not fit my fixtures.
The price for the 8 bulb pack seemed attractive, but it instantly became much less so when I discovered that 1 of the bulbs did not light. It did not glow or try to light, completely non-functional. I contacted the seller about the problem but received no response.
Based on the reviews, the bulbs tend to have defective ones so I purchased more than I needed. Sure enough a few didn't work at all. the ones which did work after install, one stopped within a month. It's been a few months and 3 are still functioning. I had purchased 8 for 4 bulb replacements. Not sure on the remaining as they haven't been installed