I am trying to calculate the current draw for 6 florescent bulbs and ballasts. There is one ballast per 36W bulb.

I know that the current draw for each bulb would be 36/240 =0.15A (0.6A total)

How do I calculate the current that the ballast draws from the mains supply.

There is a label on the ballast which states the line current is 1.3A for 120V or 0.56A for 277V. And it has a 96% Power factor.

  • 2
    \$\begingroup\$ You say that there's one ballast for each 36W fluorescent lamp, but according to the ballast specs the ballast is for 150W (or 2x 70W) lamps. Please note that electronic ballasts are designed to drive the lamp with full power. So you shouldn't use that ballast with a 36W lamp. Also please provide the datasheeet or at least the model number of the ballast. \$\endgroup\$ – Rohat Kılıç Jun 27 at 16:04

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