I've written in other threads that many of the lumen claims of Chinese LEDs are exaggerated. Spiderman told me to ignore those numbers and go by the specified watts (or amps) for the lamp. If the manufacturer only specifies amps, multiply times 12 to get the wattage. In those other threads I've claimed that headlight bulbs will put out 125 or a bit more lumens per watt, and anything significantly higher is an inflated claim.
I am now in the process of replacing dying fluorescent lamps in my shop with T8 LED tubes. I'm using a number of different lamps (4', 8'), all 4000ºK in existing fixtures and bypassing the ballasts for a type B or direct wire tube (to the 120v lighting circuit). These are marketed by Satco, and depending on the tube they will provide from 130 to 144 lumens per watt. This supports what I've said in the past, but perhaps the number of lumens/watt is creeping upward with successive generations of LED lamps. Some of the lamps I briefly considered will reach 150 lumens per watt, but they tend to be more expensive and not worth (to me) the additional cost.
I am now in the process of replacing dying fluorescent lamps in my shop with T8 LED tubes. I'm using a number of different lamps (4', 8'), all 4000ºK in existing fixtures and bypassing the ballasts for a type B or direct wire tube (to the 120v lighting circuit). These are marketed by Satco, and depending on the tube they will provide from 130 to 144 lumens per watt. This supports what I've said in the past, but perhaps the number of lumens/watt is creeping upward with successive generations of LED lamps. Some of the lamps I briefly considered will reach 150 lumens per watt, but they tend to be more expensive and not worth (to me) the additional cost.
