Would this be bright enough to trace a sketch from computer/Sketch paper onto water color paper?

I believe so. It has several brightness settings. I have used it to trace onto water color paper with no problems.

What is the difference between the A3 and the (2) A4 choices?

A3- 11.7"W x16.5"H A4- 8.3"W x 11.7"H

What size paper do I have to use ?

Actually, any size you like. You can move your work around to the spot you're tracing over. I have used this for pieces 24" x 24', by simply re positioning the original then the paper. Good luck.

Color	Black
Material	Acrylic
Brand	AGPTEK
Item Weight	420 Grams
Power Source	USB Powered
Light Source Type	Light Emitting Diode (LED)
Product Dimensions	14.06"L x 0.2"W x 9.25"H
Item Thickness	0.19 Inches
Model Name	Magnetic A4 LED Artcraft Tracing Light Pad
Recommended Uses For Product	2D Animation, Calligraphy, Embossing, Scrapbooking, Tattoo Transferring, Sketching & Drawing, Sewing projects, Stained Glass, Quilting
Manufacturer	Brainytrade
UPC	766008355879
Item Weight	14.8 ounces
Item model number	HL0280
Is Discontinued By Manufacturer	No
Material Type	Acrylic
Size	A4 Magnetic Light Pad(buttons control)
Manufacturer Part Number	HL0280

磁気 A4 LED アートクラフト トレースライトパッド 4 ライトボックス 超薄型物理ボタンコントロール メモリー機能付き USB電源パッド アニメーション、スケッチ、デザイン ステンシル X線ビューイング USBアダプター付き

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磁気 A4 LED アートクラフトトレースライトパッド 4 ライトボックス超薄型物理ボタンコントロールメモリー機能付き USB電源パッドアニメーション、スケッチ、デザインステンシル X線ビューイング USBアダプター付き