I bought one of these electronic ballasts to replace an old standard (inductive) ballast in the hope of seeing a slight increase in brightness. In fact my initial visual impression was that this electronic ballast led to a considerably lower brightness. To test this more objectively I used a light meter app on my phone. I placed the phone around 1.5m from the lamp (a new 40W T9 circular G10Q tube) and measured the light levels with this electronic ballast and with the old ballast. There were no other significant sources of light during the measurements. The result was a light level of 80 lux with this electronic ballast and 140 lux with the old ballast. While the absolute light levels will of course depend on the environment and distance from the lamp, the ratio of the two readings should give a useful indication of the relative brightness with the two ballasts. In this case using this electronic ballast led to a brightness of only around 57% of that with the old inductive ballast which confirmed my initial subjective impression. In the light of this result, I cannot recommend this electronic ballast, which does not appear to drive the lamp to its rated power. My reason for giving a two star rating rather than one star was that at least this ballast was functional and indeed successfully started an old fluorescent tube which the old ballast failed to start. Read full review
Verified purchase: Yes | Condition: New
I bought one of these units to test it on a four foot 40 watt tube and it has worked perfectly over a test period of several weeks. I removed the case and soldered longer wires to it to replace a ballast coil unit. Gone is the need for a starter switch and it lights the tube instantly. A great cost saving when compared with one intended as a unit for a 4 foot tube. It worked so well I bought six more to upgrade all our flo-tube batten fittings
Verified purchase: Yes | Condition: New
Very neat and compact product. The lumen output of the lamp does however appear to be gear very slightly less than an adjacent lamp with the old control gear. The lamps were not of the same type and this also could be the reason.
Verified purchase: Yes | Condition: New
It solved my round bathroom light not working
Verified purchase: Yes | Condition: New
Tried this ballast with a 40w circular tube and the results weren't as expected. The tube light up very dim thus it is useless. Just avoid this product.
Verified purchase: Yes | Condition: New