to clarify a bit more: use C9 strands of Christmas light bulbs (original large size). Be creative and make a harness to hold the bulbs in a circle, which will direct the light into a straight beam, looks like a doughnut style light fixture.
This is another idea to consider if you have the time, desire, creative ability but lack the resources for the commercial product.
If you have the time and expense to go this route, it may fit your needs. Especially if one does not have to travel with many spray cans or painted bulbs. If you like this answer to your projects, consider saving Christmas Light bulbs and the cord. They are already painted and can withstand the heat from the bulb, and come in various colors. You can also add a dimmer to control the lights. Place in a protective plastic container if you plan to travel with them.