I like about 3200 lumens from the source lights which you would get from 200 watts total with incandescent bulbs. To get that I use two 100 watt incandescents or two 100 watt equivalent (1600 lumens each) LED bulbs in reflector lightstands on either side, up about 7 feet high and 35 degrees back from straight above the canvas behind and to wither side of the easel. You may want to step that back to 75 watt equivalents x 2 for a bit lower light that might match someone's home lighting levels better.
The key phrase if you cant find a Lumens rating, is wording like "100 Watt Equivalent" referring to the light coming from standard 100 watt incandescent bulbs.
Pretty decent explanations of Watts vs Lumens on these two links:
- To replace a 100 watt (W) incandescent bulb, look for a bulb that gives you about 1600 lumens. If you want something dimmer, go for less lumens; if you prefer brighter light, look for more lumens.
- Replace a 75W bulb with an energy-saving bulb that gives you about 1100 lumens
- Replace a 60W bulb with an energy-saving bulb that gives you about 800 lumens
- Replace a 40W bulb with an energy-saving bulb that gives you about 450 lumens.