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Power testing the dyna vision ballast I tried these ballasts with various different lamp arrangements and a sonoff pow to see what difference if any I would get with different lamps. The result none!! These ballasts pull a constant 277W no matter what the lamp. Here it’s running a 250W Osram GEC SON T Plus from the early 80s. I tired ventrue HO 250W Philips Master CDM-T MW Eco 230W GE Constant colour 250W CMH All the same result 277W I don’t see the benefit of these less reliable ballasts over simple 250W Mag no energy saving at all. I may fire up some 250W mag tomorrow and see what power they pull.

Power testing the dyna vision ballast

I tried these ballasts with various different lamp arrangements and a sonoff pow to see what difference if any I would get with different lamps. The result none!! These ballasts pull a constant 277W no matter what the lamp. Here it’s running a 250W Osram GEC SON T Plus from the early 80s.
I tired ventrue HO 250W
Philips Master CDM-T MW Eco 230W
GE Constant colour 250W CMH

All the same result 277W I don’t see the benefit of these less reliable ballasts over simple 250W Mag no energy saving at all.
I may fire up some 250W mag tomorrow and see what power they pull.

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Patrick   [04 Apr, 2026 at 11:12 PM]
Good to test them against those 250W Tridonic mag trays I brought exactly what they replaced lol
FrontSideBus   [04 Apr, 2026 at 11:17 PM]
One advantage of these electronic ballast is they really do not care about the supply voltage! I have had one on the variac and swung the dial back and forth like a madman and there is no change in output, not even a flicker. On mag gear, reducing or increasing the voltage by just a few volts results in a visible change in output!
Kev   [04 Apr, 2026 at 11:18 PM]
Oh yeh I could easily do that tomorrow they are complete trays with a cap so good fair comparison. I was surprised the losses were so high on these. I’m feeling the itch to install 250W SON or CMH on my farm
Kev   [04 Apr, 2026 at 11:20 PM]
Yeh that’s true mark - I wonder what voltage they have had enough at?
FrontSideBus   [04 Apr, 2026 at 11:24 PM]
Be interesting to find out. Might have a go tomorrow.
Kev   [04 Apr, 2026 at 11:33 PM]
Compare results lol
AngryHorse   [05 Apr, 2026 at 09:36 AM]
These do run at a perfect power factor also Cool
FrontSideBus   [05 Apr, 2026 at 10:50 AM]
The only style of Philips ballast like this that I have is a Cosmo, which I have stabilising for a bit then I will go silly with the variac .
FrontSideBus   [05 Apr, 2026 at 10:57 AM]
Well that was interesting... I let the voltage and current stabilise at 240v input, then cranked it up to 275v. Absolutely no change in the readings at all. Not even a flicker. Then I dropped the voltage right down to 200v. Again not a sausage. But the ballast was pulling more current from the mains. In fact the lamp current and voltage did not change until I lowered the input voltage to 155v and then it extinguished!

Comment 1 to 9 of 9
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