t5 fittings

[Julius1989]

Hi All,
I went up to look at a small office room that has three t5 54w light fittings. Each fitting is a double. The lights turn on and strike immediately. Once they are on the will slowly dim down then slowly go bright again ever once in a while (not flickering and light is equal along the length of the tube). All three fittings react the same at the same time. All three fittings are fed from a normal light switch, checked all connections in fittings and switch look ok.

Someone has been past before me and put a fluke calibrated logger on for a few days and there were no voltage fluctuations.

I tried swapping tubes made no difference (didn't really think it would).

I only had 20 mins at it before home. I don't have fitting or ballast details yet. Going to have another look tomorrow.

Has anyone seen anything like this before?

Could one fitting have a duff ballast and be interfering with the others?

The building has a radar installation attached to it, could that be messing them up?

Any thoughts would be welcome, I'm going to get serious on them tomorrow and would appreciate any ideas




Thanks in advance



Julius

 

[R G]

Is there a dimming circuit involved , check the input and if there is a separate supply to a connection marked 0 to 12 V,
If thats the case then you could have a faulty sensor , the sensor is basically an occupancy sensor dimming the lights in that area if no ones around.

 

[MDJ]

May well be thorlux or dextra lights with a built in light level adjuster which dims up and down according to the light In the room,