Photoshop Tutorials: Colorful Light Burst Text
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Step 6: Use "Fill" To Fill Your Text Layer With White And Set The Blend Mode To "Multiply"
Switch back to your Layers palette once again, and with the text layer selected, go up to the Edit menu at the top of the screen and choose Fill, or press Shift+F5 on your keyboard to quickly bring up Photoshop's Fill dialog box. When the dialog box appears, set the Contents to White and change the Blending Mode to Multiply:

Click OK when you're done. Nothing will seem to have happened in your document window, but if you look at your text layer's thumbnail in the Layers palette, you'll see that all of the empty space around the text has now been filled with white, while leaving the text black thanks to that "Multiply" mode.
Step 7: Apply The Gaussian Blur Filter To The Text
Go up to the Filter menu at the top of the screen, choose Blur, and then choose Gaussian Blur. When the Gaussian Blur dialog box appears, enter a Radius value of about 4 pixels and click OK to apply a slight blurring to the text:

Here's the text after applying Gaussian Blur:

Step 8: Apply The "Solarize" Filter To The Text
With the text layer still selected, go back up to the Filter menu and this time choose Stylize, and then choose Solarize. This will turn the document black, and your text will appear as a white stroke:

Step 9: Lighten The Text With Levels
The text is looking a little dark, so let's lighten it. Use the keyboard shortcut Ctrl+L (Win) / Command+L (Mac) to bring up Photoshop's Levels command, and drag the white point slider on the right in towards the left until you reach the right edge of the histogram:

Click OK. The text will now appear much brighter:

Step 10: Make A Copy Of The Text Layer
We need to make a copy of the text layer at this point, so to do that, with the text layer selected, use the keyboard shortcut Ctrl+J (Win) / Command+J (Mac), which will add a copy of the layer above it in the Layers palette:

Make sure the copy of the text layer is selected because all of these next steps are to be done on the copy. We won't be touching the original again until near the end.