Fluorescent tube replacement by LED

[gar]

200901-2122 EDT

Experiment on an 8' LED used to replace an 8' Slimline tube. The LED is non-dimmable. Includes internal driver.

Measurements ---
Vol .. Current .. Watts .. VA .. PF
090 ... 0.51 ... 43.9 ... 46.5 ... 0.94
100 ... 0.45 ... 43.1 ... 44.9 ... 0.95
110 ... 0.39 ... 42.4 ... 43.7 ... 0.96
120 ... 0.35 ... 42.1 ... 43.0 ... 0.97
130 ... 0.32 ... 41.9 ... 42.8 ... 0.97

This is an approximately constant power load. I expect it wont show much flicker when a motor load turns on. That is a future experiment.

AC input current is half wave pulses.

If you do not care about dimming, then constant light output is desirable.

No way to know about quality, and thus life.

..

 

[LarryFine]

Includes internal driver.

Does that mean bypass wiring, power directly to the tombstone(s)?

 

[gar]

200902-0947 EDT

LarryFine:

Yes. This LED tube works directly from 120 V 60 Hz.

The original ballast is electrically completely removed, but mechanically left in place. A very simple modification. 120 neutral goes to one end, and 120 hot to the other end. If two tubes are installed, then install one reversed relative to the other because these are 1/2 wave loads.

An extremely low cost modification. Each tube costs about $20.

.

 

[zbang]

I can see interesting problems if a lot of them are all installed in the same direction.

 

[gadfly56]

I can see interesting problems if a lot of them are all installed in the same direction.

Well, really one problem, just repeated over and over.