Switched over to LED 4 foot to replace 40 T8 bulbs in my 1600 sq ft shop.
These are ballast compatible (BC) only required re & re the bulbs....no re-wiring to bypass the ballast......
When I changed out the T8 bulbs in our laundry room they went on for 5 sec then went out.
Called the 1-800 number and they told me these bulbs are only compatible with about 90% of ballast......
By-passed the ballast in that fixture and all is good......
. Bought on Amazon with free shipping........
Check out Hyperikon T8 T10 T12 LED Light Tube 4FT on Amazon.