I agree. Glass is easy to clean, I can cut on it, tape things to
it, etc. My 2 by 4 foot lightbox is glass spaced 1/2 inch over
white plastic spaced 1/2 inch over a 'prismatic' plastic light
cover. Very even illumination. The light tubes are in plastic
sleeves that filter out the UV.
Sean McGrath - Voice: 510.653.8387
Email: sean@oak.his.ucsf.EDU
Paper: 638 66th st, Oakland, Ca. 94609